60 < t < 70 12 70 < t < 80 22 80 < t < 90 23 90 < t < 100 24 100 < t < 110 19 (a) Write down the modal class interval. ........................................................... (1) (b) Calculate an estimate for the mean time taken by the students. ........................................................... seconds (4) (Total 5 marks) 7. The table gives some information about the time taken by a group of 100 students to complete an IQ test. Time (t seconds) 60 < t 70 12 ≤ 70 < t 80 22 ≤ 80 < t 90 23 ≤ 90 < t 100 24 ≤ 100 < t 110 19 ≤ Calculate an estimate for the mean time by the students. ........................................................... seconds 4 marks)
60 < t < 70 12 70 < t < 80 22 80 < t < 90 23 90 < t < 100 24 100 < t < 110 19 (a) Write down the modal class interval. ........................................................... (1) (b) Calculate an estimate for the mean time taken by the students. ........................................................... seconds (4) (Total 5 marks) 7. The table gives some information about the time taken by a group of 100 students to complete an IQ test. Time (t seconds) 60 < t ≤ 70 12 70 < t ≤ 80 22 80 < t ≤ 90 23 90 < t ≤ 100 24 100 < t ≤ 110 19 Calculate an estimate for the mean time by the students. ........................................................... seconds 4 marks)
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