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w History B Window Help Take a Test-Shane Subero Sec https://www.mathxl.com/Student/Player Test.aspx?testid. 1 7 1 886989¢ ure -yes STA2023 - Fall 2017 (8 week term) 240393 BbLinked Shane Suber 10/24/17 948 Test: Unit 3 Test Time Remaining: 01:04:14 Submit Test This Question: 1 pt I3 of 13 (0 complete) This Test: 13 pts possible es are of a days or longer b. If the length of pregnancy is in the lowest 2%, then the baby is premature. Find the length that separates premature babies from those who are not premature. a, The probability that a pregnancy will last 307 days or longer is Round to four decimal places as needed.) b. Babies who are born on or before days are considered premature (Round to the nearest integer as needed.)Explanation / Answer
= 266 = 15
a. X = 307
Z = (X - ) /
= (307 - 266) / 15
= 2.7333
Probability (right tailed) from z table = 0.0031.
b. A percentile of 0.02 corresponds to z score of -2.74
X = 266 - 2.74 * 15
= 224.9
= 225.
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