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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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Answer:

0.67449

Step-by-step explanation:

Let [tex]Q_3[/tex] 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 NORMINV
  • Enter the probability as 0.75, mean= 0 and standard deviation=1
  • Click 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

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