The time (in minutes) it takes 30 students to complete a Mathematics examination is shown in the grouped frequency distribution below. Time (minutes) 60-70 70 < 80 80 < 90 90 < 100 100 < 110 110 <120 1.2. Determine the mean time. 1.1. What percentage of students complete the examination in less than one and a half hours? 1.3. Compute the median time. 1.4. Calculate the modal time. Frequency 1.5. Calculate the standard deviation. 2 7 9 6 4 2

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The time (in minutes) it takes 30 students to complete a Mathematics examination is shown in the grouped frequency
distribution below.
Time (minutes)
60 < 70
70 < 80
80 < 90
90 < 100
100 < 110
110 <120
1.2. Determine the mean time.
1.1. What percentage of students complete the examination in less than one and a half hours?
1.3. Compute the median time.
1.4. Calculate the modal time.
Frequency
1.5. Calculate the standard deviation.
2
7
9
6
4
2
Transcribed Image Text:The time (in minutes) it takes 30 students to complete a Mathematics examination is shown in the grouped frequency distribution below. Time (minutes) 60 < 70 70 < 80 80 < 90 90 < 100 100 < 110 110 <120 1.2. Determine the mean time. 1.1. What percentage of students complete the examination in less than one and a half hours? 1.3. Compute the median time. 1.4. Calculate the modal time. Frequency 1.5. Calculate the standard deviation. 2 7 9 6 4 2
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