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| PAGE: 704 | SET: Exercises | PROBLEM: 32 |
The random sample size is 
.
of adult americians had obtained bacheors degree, thus 
.
The value of 
.
The value of mean is 
.
Substitute 
and 
.
The value is 
.
The standard deviation is 
.
Substitute , and 
.
.
The standard deviation is 
.
Find the probability 
.
.
Find the corresponding 
-values for 
and 
.
The value of 
is 
.
For 
, 
and 
.
For 
, and .
.
The approximate area corresponds to 
is 
.
Therefore, the probability that in a random sample of 
people , between 
is .
The probability that in a random sample of 
people , between 
is 
.
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