The lives (in hours of continuous use) of 100 randomly selected flashlight batteries are: Interval 6.95-7.45 7.45-7.95 7.95-8.45 8.45-8.95 8.95-9.45 9.45-9.95 9.95-10.45 hrs a. Find the mean of the battery lives. (Type an integer or a decimal. Round to two decimal places.) b. Find the standard deviation of the battery lives. hrs (Type an integer or a decimal. Round to two decimal places.) Frequency 2 8 21 39 18 10 2
The lives (in hours of continuous use) of 100 randomly selected flashlight batteries are: Interval 6.95-7.45 7.45-7.95 7.95-8.45 8.45-8.95 8.95-9.45 9.45-9.95 9.95-10.45 hrs a. Find the mean of the battery lives. (Type an integer or a decimal. Round to two decimal places.) b. Find the standard deviation of the battery lives. hrs (Type an integer or a decimal. Round to two decimal places.) Frequency 2 8 21 39 18 10 2
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:The lives (in hours of continuous use) of 100
randomly selected flashlight batteries are:
Interval
6.95-7.45
7.45-7.95
7.95-8.45
8.45-8.95
8.95-9.45
9.45-9.95
9.95 - 10.45
a. Find the mean of the battery lives. hrs
(Type an integer or a decimal. Round to two decimal places.)
b. Find the standard deviation of the battery lives. hrs
(Type an integer or a decimal. Round to two decimal places.)
Frequency
NONN
2
8
21
39
18
10
2
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