+0  
 
-1
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1
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Help 7

 Jan 4, 2019
 #1
avatar+98107 
+1

50, 46, 54, 51, 29, 52, 48, 54, 47, 48

 

Mean  = 47.9

Std Dev = 6.8

 

So....1 std dev   from the mean lies between

 

47.9 - 6.8    and 47.9 + 6.8   = 

 

41.1     and    54.7

 

There are 9 scores falling within this range  = 90% of the data

We expect 68%

 

So...."D"  is correct

 

 

cool cool cool

 Jan 5, 2019

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