A survey of 52 U.S. supermarkets yielded the following relative frequency table, where X is the number of checkout lanes at a randomly chosen supermarket. x 1 2 3 4 5 6 7 8 9 10 P(X = x) 0.01 0.04 0.04 0.08 0.10 0.15 0.25 0.20 0.08 0.05 (a). Compute ? = E(X). E(X) = (b). Find P(X < ?) or P(X > ?). P(x < ?)= P(x > ?)=

A survey of 52 U.S. supermarkets yielded the following relative frequency table, where X is the number of checkout lanes at a randomly chosen supermarket. x 1 2 3 4 5 6 7 8 9 10 P(X = x) 0.01 0.04 0.04 0.08 0.10 0.15 0.25 0.20 0.08 0.05 (a). Compute ? = E(X). E(X) = (b). Find P(X < ?) or P(X > ?). P(x < ?)= P(x > ?)=

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

A survey of 52 U.S. supermarkets yielded the following relative frequency table, where X is the number of checkout lanes at a randomly chosen supermarket.

x	1	2	3	4	5	6	7	8	9	10
P(X = x)	0.01	0.04	0.04	0.08	0.10	0.15	0.25	0.20	0.08	0.05

(a). Compute ? = E(X).

E(X) =

(b). Find P(X < ?) or P(X > ?).

P(x < ?)=

P(x > ?)=

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