Mathematics, 18.05.2021 20:50 carlomorales200

A consumer advocacy group tested the "on-air" lifetimes of a random sample of 198 cell phone batteries. The mean lifetime was 3.8 hours with a standard deviation of 0.1 hours. The lifetimes are approximately bell-shaped. Estimate the number of batteries with lifetimes between 3.7 hours and 3.9 hours.

Answers: 3

Show answers

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 17:30, NathalyN

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period. value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?

Answers: 2

continue

Mathematics, 21.06.2019 18:30, Amyra2003

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Answers: 2

continue

Mathematics, 21.06.2019 19:30, jyworthy

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Answers: 2

continue

Mathematics, 22.06.2019 02:00, sibbietiggy9372

Find the axis symmetry of x y=4x-6x+3

Answers: 1

continue

You know the right answer?

A consumer advocacy group tested the "on-air" lifetimes of a random sample of 198 cell phone batteri...