4. ( The scores of students on the ACT college entrance examination in a recent year had the normal distribution with mean = 20.7 and standard deviation = 5. a. What is the probability that a single student randomly chosen from all those taking the test scores 18 or higher? b. What is the probability that the mean score of a random sample of 25 students from all those taking the test is 18 or higher?

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4. (
The scores of students on the ACT college entrance examination in a recent
year had the normal distribution with mean = 20.7 and standard deviation o = 5.
a. What is the probability that a single student randomly chosen from all those taking the
test scores 18 or higher?
b. What is the probability that the mean score of a random sample of 25 students from all
those taking the test is 18 or higher?
ed at my academic
5
Transcribed Image Text:4. ( The scores of students on the ACT college entrance examination in a recent year had the normal distribution with mean = 20.7 and standard deviation o = 5. a. What is the probability that a single student randomly chosen from all those taking the test scores 18 or higher? b. What is the probability that the mean score of a random sample of 25 students from all those taking the test is 18 or higher? ed at my academic 5
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