Question

The table below gives sample data of seven full time students. The data is number of...

The table below gives sample data of seven full time students. The data is number of hours they worked in a week during the semester. Calculate the mean and standard deviation.

10, 12, 20, 25, 8, 12, 9

Math   Statistics-And-Probability   
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Answer #1

Solution:

x x2
10 100
12 144
20 400
25 625
8 64
12 144
9 81
x= 96 x2=1558



Mean     = (x / n) )

=(10+12+20+25+8+12+9)7

=96 /7

=13.7143

Mean = 13.71

The sample standard is S

S = ( x2 ) - (( x)2 / n ) n -1

=1558-(96)276

=*1558-1316.5714 ) 6

=241.42866

=40.2381

=6.3434

The sample standard is 6.34

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