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What is the value

What is the value for x2left for a 95% confidence interval when n = 18?

a. 7.564

b. 8.672

c. 9.390

d. 8.231

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## Q : Find the probability mass function

Detemine the probability mass function for X. Let the random variable X be equally to assume any of the values 1/8, 1/4, or 3/8. Please show how to find the Probability Mass Function.