Question

the data were collected for a study of the cost of meals at 26 restaurants located in a major city.

41 37 51 22 24 41 26 26 33 75 62 13 30

34 43 62 53 57 50 45 68 48 39 39 35 35

1. report the sample mean and st. dev. for the cost of meals. You may use some of the following data summaries.

x=1089 , x(squared)=51223 , (x-xbar)squared =5610.654

2. make a stem and leaf display and report the five number summary.

show all work

Answer 1

Given datas

Number of sample (n)=26

1) Mean

variance

Standard deviation

2) Now the Steam and leaf diagramme for the data is

In a stem and leaf diagramme
The "stem" values are listed down, and the "leaf" values are listed next to them.
This way the "stem" groups the cost in 10th digit and each "leaf" indicates a cost within that group.

here the cost vary from 13 to 75 i.e. minimum cost is 13 and the maximum cost is 75 the maximum frequency of costs are found around the stem value of 3 and the the least frequency are around steam 1 and 7 .