Sum18-Math1342-A2-CRN30347-ONLINE Paola Colmenero & I 7/5/18 8:41 PM Test: Exam3

Question

Sum18-Math1342-A2-CRN30347-ONLINE Paola Colmenero & I 7/5/18 8:41 PM Test: Exam3-over Ch 6 &7 Post-Test(GRADED neem 000Suent e Time Remaining: 07:00:05 This Question: 1 pt 9 of 20 (16 complete) This Test: 20 pts possible as of Assume that adults have IQ scores that are normally distributed with a mean of ?-100 and a standard deviation ?-20. Find te probability that a randomly selected adult has an IQ less than 120 Click to view The probability that a randomly selected adult has an IQ less than 120 is ? (Type an integer or decimal rounded to four decimal places as needed.) me Enter your answer in the answer box

Explanation / Answer

Solution:

Given in the question

Mean = 100

Standard deviation =20

P(Xbar<120)

Z =(120-100)/20 =20/20 =1

From z table we found that at Z=1

P(xbar<120) = 0.8413 or 84.13%

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