Save omework: Chapter6 N Score: 18 31 of 49 (17 complete) core: 0 of 1 pt Questi

Question

Save omework: Chapter6 N Score: 18 31 of 49 (17 complete) core: 0 of 1 pt Question Help .3.19 Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. Find the third quartile Q3, which is the IQ score separating the top 25% from the others. Click to view page 1 of the table, Click to view page 2 of the table. The third quartile, Q3, is (Round to one decimal place as needed.) mi Enter your answer in the answer box and then click Check Answer. Check Answer All parts showing Clear All 69 12

Explanation / Answer

From the standard normal tables, we get:

P(Z > 0.6745 ) = 0.25

Therefore 0.6745 is the z score for the third quartile value.

Therefore, the third quartile value here is computed as:

Q3 = Mean + 0.6745*Std Dev = 100 + 0.6745*15 = 110.1175

Therefore 110.1 is the third quartile value here.

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