What percent of the phones have a battery life less than 5 or greater than 5.5 hours?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.5: Interpreting Data
Problem 1C
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What percent of the phones have a battery life less than 5 or greater than 5.5 hours?
2. The talk-time battery life of a group of
cell phones is normally distributed with
a mean of 5 hours and a standard
deviation of 15 minutes.
a) What percent of the phones have a battery
life of at least 4 hours and 45 minutes?
b) What percent of the phones have a battery
life between 4.5 hours and 5.25 hours?
c) What percent of the phones have a battery
life less than 5 hours or greater than 5.5
hours?
Transcribed Image Text:2. The talk-time battery life of a group of cell phones is normally distributed with a mean of 5 hours and a standard deviation of 15 minutes. a) What percent of the phones have a battery life of at least 4 hours and 45 minutes? b) What percent of the phones have a battery life between 4.5 hours and 5.25 hours? c) What percent of the phones have a battery life less than 5 hours or greater than 5.5 hours?
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