Scores of high school students on a national mathematics exam in Egypt were normally distributed with a mean of 86 and a standard deviation of 4. A) What is the probability that a randomly selected student will have a score of 80 or higher? B) If there were 97,680 students with scores higher than 91, how many students took the test? ___________________ _ (Remove all commas from your answer before submitting).
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Question 2
Which of the following statements are correct?
a. A confidence level expresses the degree of certainty that an interval will include the actual value of the population parameter.
b. A confidence level expresses the degree of certainty that a point estimate will include the actual value of the population parameter.
c. A confidence level expresses the degree of certainty that an interval will include the actual value of the sample statistic.
d. A confidence level expresses the degree of certainty that a point estimate will include the actual value of the sample statistic.
e. None of these statements is correct.
(a) With few ticks, moose retain a brown coat; (b) at high numbers of ticks, moose self-groom, destr
If the random variable x is exponentially distributed with parameter λ = 4, then P(x ≤ ...