+0  
 
0
34
1
avatar+4677 

Help 6

 Jan 4, 2019
 #1
avatar+94209 
+1

55, 54, 66, 38, 53, 56, 57,  66, 45, 65

 

Mean =  55.5

Std Dev  = 8.6

 

Scores falling within 1 Std Dev from the mean are between

 

55.5 - 8.6    and  55.5 + 8.6   =

 

46.9   and   64.1

 

6  fall within 1 Std Dev    =  60%

We expect 68%

 

So...."B" is correct

 

 

cool cool cool

 Jan 5, 2019

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