Find the standard deviation for the group of data items.

Question

Find the standard deviation for the group of data items.

Stems:

3

4

5

 

Leaves:
7
2 7  
2 7

The mean I got is 47 and the numbers totaled up when subtracted it by the mean ^2 is 250. Not sure where to go from there

Answer 1

Yes, you are correct.

 

You found the variance of 250.

 

The formula for standard deviation is  square-root( variance/(n-1))

 

There are  5 statistics in the data set, so N=5

 

The standard deviation is then square-root( 250/4) = square-root(62.5) = 7.905694