Question: a. What is the probability that grain size exceeds 100? b. What is the probability that grain size is between 50 and 80? c. What

a. What is the probability that grain size exceeds 100?

b. What is the probability that grain size is between 50 and 80?

c. What interval

(a,

b) includes the central 90% of all grain sizes (so that 5% are below a and 5% are above b)?

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