A sample of final exam scores is normally distributed with a
mean equal to 20 and a variance equal to 16.
Part (a)
What percentage of scores are between 16 and 24? (Round your
answer to two decimal places.)
%
Part (b)
What raw score is the cutoff for the top 10% of scores? (Round
your answer to one decimal place.)
Part (c)
What is the proportion below 15? (Round your answer to four decimal places.)
Part (d)
What is the probability of a score less than 25? (Round your answer to four decimal places.)
A sample of final exam scores is normally distributed with a mean equal to 20 and...
A sample of final exam scores is normally distributed with a mean equal to 29 and a variance equal to 16. Part (a) What percentage of scores are between 25 and 33? (Round your answer to two decimal places.) Part (b) What raw score is the cutoff for the top 10% of scores? (Round your answer to one decimal place.) Part (c) What is the proportion below 23? (Round your answer to four decimal places.) Part (d) What is the...
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Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 79 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least four decimal places. (a) What proportion of the scores were above 93? (b) What proportion of the scores were below 66? (c) What is the probability that a randomly chosen score is between 70 and 90?
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Problem 3: Scores on an exam are assumed to be normally distributed with mean /u = 75 and variance a2 = 25 (1) What is the probability that a person taking the examination scores higher than 70? (2) Suppose that students scoring in the top 10.03% of this distribution are to receive an A grade. What is the minimum score a student must achieve to earn an A grade? (3) What must be the cutoff point for passing the examination...
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