KRose3311
16.03.2020 •
Mathematics
A certain mental development index for infants is a standardized measure used in observing infants over time. It is approximately normal with a mean of 99 and a standard deviation of 19. Find the z-score corresponding to the upper quartile (Q3) of a normal distribution.
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Ответ:
0.67449
Step-by-step explanation:
Let
be the 3rd quartile of normal distribution .
-z-score corresponding to the upper quartile can be calculated in excel as:
In Excel, click on any empty cell'Type the function NORMINVEnter the probability as 0.75, mean= 0 and standard deviation=1Click the enter button.-The output is 0.67449. Hence, the z-score corresponding to the upper quartile (Q3) of a normal distribution is 0.67499
Ответ:
(10)9
Step-by-step explanation: