Jimmy is the education consultant of a tutorial school, which arranges preparatory classes for IELT examination. He randomly checks the mock examination result of 22 students in the school and the results are as follow: 7.9 8.2 7.8 5.4 6.8 6.8 7.1 7.2 7.9 8.1 7.6 7.8 5.8 6.3 7.7 7.7 8.3 8.3 4.7 5.1 7.3 6.5 (a) Write a report to reflect students' ability in the mock examination. The report needs to include the average performance, the median, the standard deviation, the bottom 20% and top 10% performance level. (b) The manager asks if the distribution of the examination result looks like a normal distribution. Answer his question by reviewing the skewness of the data with detailed calculation. (c) There are 18 students in Alex's class. By using the sampled data as a reference to project the chance an individual student can get more than 6 marks and assume students' result are independent, calculate the probability that more than 80% of Alex's students can score higher than 6 marks in the mock examination.
Jimmy is the education consultant of a tutorial school, which arranges preparatory classes for IELT examination. He randomly checks the mock examination result of 22 students in the school and the results are as follow: 7.9 8.2 7.8 5.4 6.8 6.8 7.1 7.2 7.9 8.1 7.6 7.8 5.8 6.3 7.7 7.7 8.3 8.3 4.7 5.1 7.3 6.5 (a) Write a report to reflect students' ability in the mock examination. The report needs to include the average performance, the median, the standard deviation, the bottom 20% and top 10% performance level. (b) The manager asks if the distribution of the examination result looks like a normal distribution. Answer his question by reviewing the skewness of the data with detailed calculation. (c) There are 18 students in Alex's class. By using the sampled data as a reference to project the chance an individual student can get more than 6 marks and assume students' result are independent, calculate the probability that more than 80% of Alex's students can score higher than 6 marks in the mock examination.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 10CYU
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Q2 a, b, c. Thank you.
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