= 16 is 7.2.7 WP SS VS A random sample of size n₁ selected from a normal population with a mean of 75 and a stan- dard deviation of 8. A second random sample of size n₂ = 9 is taken from another normal population with mean 70 and standard deviation 12. Let X₁ and X2 be the two sample means. Find: a. The probability that X₁ - X2 exceeds 4 b. The probability that 3.5 ≤ X₁ - X₂ ≤ 5.5 7.2.6 WP VS The amount of time that a customer spends wait- ing at an airport check-in counter is a random variable with mean 8.2 minutes and standard deviation 1.5 minutes. Suppose that a random sample of n = 49 customers is observed. Find the probability that the average time waiting in line for these customers is a. Less than 10 minutes b. Between 5 and 10 minutes c. Less than 6 minutes
= 16 is 7.2.7 WP SS VS A random sample of size n₁ selected from a normal population with a mean of 75 and a stan- dard deviation of 8. A second random sample of size n₂ = 9 is taken from another normal population with mean 70 and standard deviation 12. Let X₁ and X2 be the two sample means. Find: a. The probability that X₁ - X2 exceeds 4 b. The probability that 3.5 ≤ X₁ - X₂ ≤ 5.5 7.2.6 WP VS The amount of time that a customer spends wait- ing at an airport check-in counter is a random variable with mean 8.2 minutes and standard deviation 1.5 minutes. Suppose that a random sample of n = 49 customers is observed. Find the probability that the average time waiting in line for these customers is a. Less than 10 minutes b. Between 5 and 10 minutes c. Less than 6 minutes
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
Related questions
Question
Answer questions 7.2.6 and 7.2.7 respectively with detailed and clear solutions please

Transcribed Image Text:= 16 is
7.2.7 WP SS VS A random sample of size n₁
selected from a normal population with a mean of 75 and a stan-
dard deviation of 8. A second random sample of size n₂ = 9 is
taken from another normal population with mean 70 and standard
deviation 12. Let X₁ and X2 be the two sample means. Find:
a. The probability that X₁ - X2 exceeds 4
b. The probability that 3.5 ≤ X₁ - X₂ ≤ 5.5

Transcribed Image Text:7.2.6 WP VS The amount of time that a customer spends wait-
ing at an airport check-in counter is a random variable with
mean 8.2 minutes and standard deviation 1.5 minutes. Suppose
that a random sample of n = 49 customers is observed. Find
the probability that the average time waiting in line for these
customers is
a. Less than 10 minutes b. Between 5 and 10 minutes
c. Less than 6 minutes
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