Chapter 4 Numerical Descriptive Measures of Data

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b) A telecommunication company conducts a research on their new data plan for students. A sample of students from College AAA were asked how much they spent monthly on a cell phone plan. The data is shown as follow. Monthly spending on cell phone plan (RM) Number of students 30-39 40-49 \" i) Determine the sample size and element used for the above study. (2 marks) ii] Find the mean and standard deviation of the monthly cell phone plan spent by students. (5 marks) v) Majority ofthe students spent y on their monthly cell phone plan. Estimate the value of y by using most suitable measurements. Hence, name the value of y. (4 marks) vi] The mean and variance of the monthly cell phone plan spent by students from CollegeZZZwere RMBO and Rlvl'l 00, respectively. Determine which college is more consistent in its monthly cell phone plan using suitable statistical measurement