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Calculate the mean of numbers

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# 1  
Old 06-01-2013
Calculate the mean of numbers
I have a text file which has 3 columns. The first two columns are shown below.

Code:
57  7
23  8
14  17
23  1

I need to print mean using the following formula .

mean =sum of the numbers of $2/total numbers of $1

output:-

Code:
sum of $2 = 33
total numbers = 4
mean= 8.25

Last edited by Scrutinizer; 06-01-2013 at 10:22 AM.. Reason: code tags
# 2  
Old 06-01-2013
Code:
cat file

57 7
23 8
14 17
23 1

 awk '{sum+=$2} END {printf("sum of $2 = %d\ntotal numbers = %d\nmean = %.2f\n", sum, NR, sum/NR)}' file

sum of $2 = 33
total numbers = 4
mean = 8.25

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