Supermarkets 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: 26 x 1 2 3 4 5 6 7 8 9 10 P ( X = x ) .01 .04 .04 .08 .10 .15 .25 .20 .08 .05 a. Compute μ = E ( X ) , and interpret the result. [ hinT: See Example 3.] b. Which is larger: P ( X < μ ) or P ( X > μ ) ? Interpret the result.
Supermarkets 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: 26 x 1 2 3 4 5 6 7 8 9 10 P ( X = x ) .01 .04 .04 .08 .10 .15 .25 .20 .08 .05 a. Compute μ = E ( X ) , and interpret the result. [ hinT: See Example 3.] b. Which is larger: P ( X < μ ) or P ( X > μ ) ? Interpret the result.
Solution Summary: The author calculates the value of mu =E(X) based on the relative frequency table.
Supermarkets 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:26
x
1
2
3
4
5
6
7
8
9
10
P
(
X
=
x
)
.01
.04
.04
.08
.10
.15
.25
.20
.08
.05
a. Compute
μ
=
E
(
X
)
, and interpret the result. [hinT: See Example 3.]
b. Which is larger:
P
(
X
<
μ
)
or
P
(
X
>
μ
)
? Interpret the result.
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