1
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Seven students took a test. Each student has one score.

2
00:00:05,783 --> 00:00:07,843
Seventy-two.

3
00:00:07,933 --> 00:00:09,753
Eighty-five.

4
00:00:09,850 --> 00:00:11,670
Eighty-five.

5
00:00:11,766 --> 00:00:13,418
Ninety.

6
00:00:13,516 --> 00:00:15,408
Ninety-two.

7
00:00:15,500 --> 00:00:17,488
Ninety-five.

8
00:00:17,583 --> 00:00:19,427
One hundred.

9
00:00:19,516 --> 00:00:24,096
The mean. Find the average of these scores.

10
00:00:24,983 --> 00:00:28,651
Add all the scores, then divide by seven.

11
00:00:30,250 --> 00:00:33,102
The average is about eighty-eight.

12
00:00:33,200 --> 00:00:36,004
This is the average on the chart.

13
00:00:39,800 --> 00:00:43,972
The median. What is the middle score?

14
00:00:46,066 --> 00:00:47,982
The middle one.

15
00:00:49,566 --> 00:00:51,506
It is ninety.

16
00:00:54,800 --> 00:00:59,380
The mode. Which score appears most often?

17
00:01:01,466 --> 00:01:04,006
This one, twice.

18
00:01:05,600 --> 00:01:07,420
Eighty-five.

19
00:01:10,716 --> 00:01:13,520
From the lowest to the highest.

20
00:01:21,116 --> 00:01:25,312
From seventy-two to one hundred, twenty-eight.

21
00:01:30,200 --> 00:01:36,172
Six students skipped rope. Each has a number of jumps per minute.

22
00:01:36,266 --> 00:01:38,182
Forty-five.

23
00:01:38,266 --> 00:01:40,134
Fifty-two.

24
00:01:40,233 --> 00:01:42,077
Forty-eight.

25
00:01:42,166 --> 00:01:44,106
Fifty-five.

26
00:01:44,200 --> 00:01:45,804
Fifty.

27
00:01:45,900 --> 00:01:47,696
Forty-four.

28
00:01:47,783 --> 00:01:52,363
The mean. Find the average of these scores.

29
00:01:53,250 --> 00:01:56,990
Add all the jumps, then divide by six.

30
00:01:58,583 --> 00:02:01,435
The average is about forty-nine.

31
00:02:01,533 --> 00:02:04,337
This is the average on the chart.

32
00:02:08,133 --> 00:02:10,793
What is the range of the jumps?

33
00:02:18,383 --> 00:02:21,931
From forty-four to fifty-five, eleven.

34
00:02:26,816 --> 00:02:31,996
Seven numbers. Sort them and find the middle one.

35
00:02:32,083 --> 00:02:33,735
Three.

36
00:02:33,833 --> 00:02:35,485
Three.

37
00:02:35,583 --> 00:02:37,115
Five.

38
00:02:37,200 --> 00:02:38,732
Five.

39
00:02:38,816 --> 00:02:40,348
Five.

40
00:02:40,433 --> 00:02:41,965
Five.

41
00:02:42,050 --> 00:02:43,582
Five.

42
00:02:43,666 --> 00:02:47,838
The median. What is the middle score?

43
00:02:49,933 --> 00:02:51,849
The middle one.

44
00:02:53,433 --> 00:02:55,877
The middle one is five.

45
00:02:59,766 --> 00:03:04,874
Now eight numbers. Sort them and find the middle.

46
00:03:04,966 --> 00:03:06,618
Three.

47
00:03:06,716 --> 00:03:08,368
Three.

48
00:03:08,466 --> 00:03:10,118
Three.

49
00:03:10,216 --> 00:03:11,748
Five.

50
00:03:11,833 --> 00:03:13,365
Five.

51
00:03:13,450 --> 00:03:14,982
Five.

52
00:03:15,066 --> 00:03:16,598
Five.

53
00:03:16,683 --> 00:03:18,215
Five.

54
00:03:18,300 --> 00:03:23,312
Two numbers are in the middle. What is their average?

55
00:03:25,400 --> 00:03:27,316
The middle one.

56
00:03:28,900 --> 00:03:31,320
The median is five.

57
00:03:36,216 --> 00:03:40,748
Set 1. Find the mode and the range.

58
00:03:40,833 --> 00:03:42,485
Four.

59
00:03:42,583 --> 00:03:44,235
Four.

60
00:03:44,333 --> 00:03:45,985
Four.

61
00:03:46,083 --> 00:03:47,735
Six.

62
00:03:47,833 --> 00:03:49,485
Seven.

63
00:03:49,583 --> 00:03:51,235
Seven.

64
00:03:51,333 --> 00:03:52,985
Nine.

65
00:03:53,083 --> 00:03:57,711
The mode. Which value appears most often?

66
00:03:59,800 --> 00:04:01,428
This one.

67
00:04:03,016 --> 00:04:05,028
This is the mode.

68
00:04:08,316 --> 00:04:10,376
What is the range?

69
00:04:17,966 --> 00:04:20,074
This is the range.

70
00:04:24,966 --> 00:04:29,498
Set 2. Find the mode and the range.

71
00:04:29,583 --> 00:04:31,115
Twelve.

72
00:04:31,200 --> 00:04:32,732
Twelve.

73
00:04:32,816 --> 00:04:34,564
Fifteen.

74
00:04:34,650 --> 00:04:36,398
Fifteen.

75
00:04:36,483 --> 00:04:38,231
Fifteen.

76
00:04:38,316 --> 00:04:39,968
Eighteen.

77
00:04:40,066 --> 00:04:41,718
Twenty.

78
00:04:41,816 --> 00:04:43,468
Twenty.

79
00:04:43,566 --> 00:04:48,194
The mode. Which value appears most often?

80
00:04:50,283 --> 00:04:51,911
This one.

81
00:04:53,500 --> 00:04:55,512
This is the mode.

82
00:04:58,800 --> 00:05:00,860
What is the range?

83
00:05:08,450 --> 00:05:10,558
This is the range.

84
00:05:15,450 --> 00:05:20,006
Set 3. Find the mode and the range.

85
00:05:20,100 --> 00:05:21,992
Twenty-three.

86
00:05:22,083 --> 00:05:24,071
Twenty-five.

87
00:05:24,166 --> 00:05:26,154
Twenty-five.

88
00:05:26,250 --> 00:05:28,118
Twenty-eight.

89
00:05:28,216 --> 00:05:30,084
Twenty-eight.

90
00:05:30,183 --> 00:05:31,691
Thirty.

91
00:05:31,783 --> 00:05:36,411
The mode. Which value appears most often?

92
00:05:38,500 --> 00:05:40,128
This one.

93
00:05:41,716 --> 00:05:43,728
This is the mode.

94
00:05:47,016 --> 00:05:49,076
What is the range?

95
00:05:56,666 --> 00:05:58,774
This is the range.

96
00:06:03,666 --> 00:06:08,750
Ten students. Their weekly pocket money in yuan.

97
00:06:08,850 --> 00:06:10,502
Twenty.

98
00:06:10,600 --> 00:06:12,252
Twenty.

99
00:06:12,350 --> 00:06:14,002
Twenty.

100
00:06:14,100 --> 00:06:15,752
Twenty.

101
00:06:15,850 --> 00:06:17,838
Twenty-five.

102
00:06:17,933 --> 00:06:19,921
Twenty-five.

103
00:06:20,016 --> 00:06:22,004
Twenty-five.

104
00:06:22,100 --> 00:06:23,608
Thirty.

105
00:06:23,700 --> 00:06:25,208
Thirty.

106
00:06:25,300 --> 00:06:27,144
One hundred.

107
00:06:27,233 --> 00:06:31,813
The mean. Find the average of these scores.

108
00:06:32,700 --> 00:06:36,368
Add all the money, then divide by ten.

109
00:06:37,966 --> 00:06:41,394
The average is about thirty-one point five.

110
00:06:41,483 --> 00:06:44,287
This is the average on the chart.

111
00:06:48,083 --> 00:06:52,255
The median. What is the middle score?

112
00:06:54,350 --> 00:06:56,266
The middle one.

113
00:06:57,850 --> 00:07:00,678
The median is twenty-five.

114
00:07:03,966 --> 00:07:08,546
The mode. Which score appears most often?

115
00:07:10,633 --> 00:07:12,261
This one.

116
00:07:13,850 --> 00:07:16,654
Twenty appears four times.

117
00:07:19,950 --> 00:07:23,949
The one hundred pulls the average up. The median and the

118
00:07:24,049 --> 00:07:28,634
mode stay in the middle, so they represent most students better.

119
00:07:30,333 --> 00:07:34,025
Class A. Ten students took the test.

120
00:07:34,116 --> 00:07:36,248
Seventy-five.

121
00:07:36,333 --> 00:07:38,417
Seventy-eight.

122
00:07:38,516 --> 00:07:39,928
Eighty.

123
00:07:40,016 --> 00:07:41,716
Eighty-two.

124
00:07:41,816 --> 00:07:43,636
Eighty-five.

125
00:07:43,733 --> 00:07:45,553
Eighty-five.

126
00:07:45,650 --> 00:07:47,398
Eighty-eight.

127
00:07:47,483 --> 00:07:49,135
Ninety.

128
00:07:49,233 --> 00:07:51,125
Ninety-two.

129
00:07:51,216 --> 00:07:53,204
Ninety-five.

130
00:07:53,300 --> 00:07:57,880
The mean. Find the average of these scores.

131
00:07:58,766 --> 00:08:02,458
Add all the scores, then divide by ten.

132
00:08:04,050 --> 00:08:07,238
The average of Class A is eighty-five.

133
00:08:07,333 --> 00:08:10,137
This is the average on the chart.

134
00:08:13,933 --> 00:08:16,497
What is the range for Class A?

135
00:08:24,083 --> 00:08:26,695
Class A range is twenty.

136
00:08:31,583 --> 00:08:35,155
Class B. Ten students took the test.

137
00:08:35,250 --> 00:08:36,974
Sixty.

138
00:08:37,066 --> 00:08:39,078
Sixty-five.

139
00:08:39,166 --> 00:08:41,034
Seventy.

140
00:08:41,133 --> 00:08:43,265
Seventy-five.

141
00:08:43,350 --> 00:08:45,170
Eighty-five.

142
00:08:45,266 --> 00:08:47,086
Eighty-five.

143
00:08:47,183 --> 00:08:48,835
Ninety.

144
00:08:48,933 --> 00:08:50,921
Ninety-five.

145
00:08:51,016 --> 00:08:52,932
Ninety-eight.

146
00:08:53,016 --> 00:08:54,860
One hundred.

147
00:08:54,950 --> 00:08:59,530
The mean. Find the average of these scores.

148
00:09:00,416 --> 00:09:04,108
Add all the scores, then divide by ten.

149
00:09:05,700 --> 00:09:09,560
The average of Class B is about eighty-two point three.

150
00:09:09,650 --> 00:09:12,454
This is the average on the chart.

151
00:09:16,250 --> 00:09:18,838
What is the range for Class B?

152
00:09:26,433 --> 00:09:28,925
Class B range is forty.

153
00:09:33,216 --> 00:09:37,820
Class A has a smaller range, so Class A is more consistent.