Question

The following data represent the travel time (in minutes) to school for seven students enrolled in...

The following data represent the travel time (in minutes) to school for seven students enrolled in Chaffey College. Treat the seven students as a sample.   

Student

Travel time

John

30

Jeff

24

Kevin

14

Ron

40

Noel

32

Mary

22

Christy

27

(a) Find standard deviation of the sample. (b) Find variance of the sample.  

Math   Statistics-And-Probability   
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Answer #1

the necessary calculation table :-

travel time (x) x2
30 900
24 576
14 196
40 1600
32 1024
22 484
27 729
sum=189 sum=5509

number of observations(n) =7

a).the sample standard deviation is :-

b).the sample variance is;-

*** if you have any doubt regarding the problem please write it in the comment box.if you are satisfied please give me a LIKE if possible...

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