Directions: Read and analyze the giver final answer on a separate sheet of pape 1. ILAW Manufacturing company prod with a standard deviation of 110 hou lifetime of a random sample of 15 of the 2. A school principal claims that grade standard deviation of 4. Suppose that th Vhat is the probability that a randomly acs than 90?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 19PPS
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Central Limit Theorem
Directions: Read and analyze the given problems below. Write your solutions and
final answer on a separate sheet of
рaper.
1. ILAW Manufacturing company produces bulbs that last a mean of 900 hours
with a standard deviation of 110 hours. What is the probability that the mean
lifetime of a random sample of 15 of these bulbs is less than 850 hours?
2. A school principal claims that grade 11 students have a mean grade of 86 with a
standard deviation of 4. Suppose that the distribution is approximately normal.
What is the probability that a randomly selected grade will be greater than 82 but
less than 90?
Transcribed Image Text:Directions: Read and analyze the given problems below. Write your solutions and final answer on a separate sheet of рaper. 1. ILAW Manufacturing company produces bulbs that last a mean of 900 hours with a standard deviation of 110 hours. What is the probability that the mean lifetime of a random sample of 15 of these bulbs is less than 850 hours? 2. A school principal claims that grade 11 students have a mean grade of 86 with a standard deviation of 4. Suppose that the distribution is approximately normal. What is the probability that a randomly selected grade will be greater than 82 but less than 90?
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