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12 Nov 2021
Given information
Given that, X ~ N(60, 9). Suppose that you form random samples of 25 from this distribution. Let X ¯ be the random variable of averages. Let ΣX be the random variable of sums. For parts c through f, sketch the graph, shade the region, label and scale the horizontal axis for X ¯ , and find the probability.
We have to find the minimum value for the upper quartile for the sum.
Step-by-step explanation
Step 1.
We have
Then the minimum value for the upper quartile for the sum is
(where 0.75 is the probability of the area).
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