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PONBallfordM89
23.09.2019 •
Mathematics
The intelligence quotient (iq) test scores for adults are normally distributed with a population mean of 100 and a population standard deviation of 15. what is the probability we could select a sample of 50 adults and find that the mean of this sample is between 98 and 103?
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Ответ:
0.7471
Step-by-step explanation:
Given : The Intelligence Quotient (IQ) test scores for adults are normally distributed with a population mean of
and a population standard deviation of
.
Sample size = 50
Using formula
, the z-value corresponding to x=98 will be:-
Z-value corresponding to x=103 will be:-
Using the standard normal distribution table for z-scores, we have
P-value =![P(98](/tpl/images/0255/2450/0aa88.png)
Hence, the probability we could select a sample of 50 adults and find that the mean of this sample is between 98 and 103 = 0.7471
Ответ:
and 5 dvd would b 5 times 14 so 70 dollars for 5 dvds