Suppose the scores earned on Professor McArthur’s third statistics exam are normally distributed with mean 64 and standard deviation 8. Professor McArthur wants to curve the exam scores as follows: The top 6% get an A, the next 14% get a B, the middle 60% get a C, the bottom 6% fail, and the rest earn a D. Any student who can determine these cut-offs earns 5 bonus points. Determine the cut-offs for Professor McArthur.
Answer to relevant QuestionsIn a poll conducted by the Gallup organization, 16% of adult, employed Americans were dissatisﬁed with the amount of their vacation time. You conduct a survey of 500 adult, employed Americans. (a) Approximate the ...Imagine that a friend of yours is always late. Let the random variable X represent the time from when you are supposed to meet your friend until he shows up. Suppose your friend could be on time (x = 0) or up to 30 minutes ...Monthly charges for cell phone plans in the United States are normally distributed with mean µ = +62 and standard deviation σ = +18. (a) Draw a normal curve with the parameters labeled. (b) Shade the region that ...Determine the area under the standard normal curve that lies to the left of (a) z = -2.45 (b) z = -0.43 (c) z = 1.35 (d) z = 3.49 Find the indicated areas. Be sure to draw a standard normal curve and shade the area that ...Find the value of za . z0.02
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