lard deviation σ = .55. a. For online orders filled by the eastern DC, find P(x ≤5). b. For online orders filled by the eastern DC, find P(4≤ x ≤7).

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Solve WITHOUT excel I know that the final answer is supposed to be 0.3875 for part A but I keep getting 0.385
4.99 DELIVERY TIMES FOR ONLINE ORDERS. Refer to the
PUTIN
Journal of Marketing Research (October 2019) study of delivery
MERE
times for online orders, Exercise 2.88 (p. 88). Recall that a
PETENZEN
P
SEM NEM MINDEN
PM WW
major apparel retailer has two distribution centers (DCs) to
MEN WHEN
SEHEME MEMMERTER HE
E
fulfill all its online orders - one located in the eastern United
IN MEMENUHI NZI
PREZE
States and one in the western United States. Based on the study,
P
C
PM M
we can assume that the delivery time x (in business days) for
online orders fulfilled by the eastern DC is normally distributed
with mean = 5.22 and standard deviation o= .77. Similarly,
assume that the delivery time x for online orders fulfilled by the
PER
western DC is
DC is normally distributed with mean µ = 6.95 and
P
standard deviation σ = .55.
a. For online orders filled by the eastern DC, find
P(a ≤ 5).
b. For online orders filled by the eastern DC, find
P(4≤ ≤7).
Transcribed Image Text:4.99 DELIVERY TIMES FOR ONLINE ORDERS. Refer to the PUTIN Journal of Marketing Research (October 2019) study of delivery MERE times for online orders, Exercise 2.88 (p. 88). Recall that a PETENZEN P SEM NEM MINDEN PM WW major apparel retailer has two distribution centers (DCs) to MEN WHEN SEHEME MEMMERTER HE E fulfill all its online orders - one located in the eastern United IN MEMENUHI NZI PREZE States and one in the western United States. Based on the study, P C PM M we can assume that the delivery time x (in business days) for online orders fulfilled by the eastern DC is normally distributed with mean = 5.22 and standard deviation o= .77. Similarly, assume that the delivery time x for online orders fulfilled by the PER western DC is DC is normally distributed with mean µ = 6.95 and P standard deviation σ = .55. a. For online orders filled by the eastern DC, find P(a ≤ 5). b. For online orders filled by the eastern DC, find P(4≤ ≤7).
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