Examlex
Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6.
a.What is the probability that a randomly selected exam will have a score of at least 71?
b.What percentage of exams will have scores between 89 and 92?
c.If the top 2.5% of test scores receive merit awards, what is the lowest score eligible for an award?
d.If there were 334 exams with scores of at least 89, how many students took the exam?
Q12: Refer to Exhibit 5-11.The probability of no
Q12: As the number of degrees of freedom
Q19: A retailer of electronic equipment received six
Q19: Two of the cylinders in an eight-cylinder
Q25: Refer to Exhibit 5-6.The expected number of
Q58: If P(A)= 0.4,P(B | A)= 0.35,P(A
Q64: In a poll of 600 voters in
Q126: For a standard normal distribution,determine the probability
Q129: Students of a large university spend an
Q139: The time it takes to hand carve