Deciles the 10th 20th 30th 40th 50th 60th 70th 80th 90th, Ask an Expert

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(Deciles.) The 10th, 20th, 30th, 40th, 50th, 60th, 70th, 80th, 90th, and 100th percentiles for X are called its deciles.

(a) State the definition of the 40th decile for X in terms of probabilities.

(b) Let X be Poisson with As = 10. Find the 6th decile for X.

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