The time until recharge for a battery in a laptop computer under common conditions is normally distributed with mean of 270 minutes and a standard deviation of 50 minutes. a) What is the probability that a battery lasts more than four hours? i (Round the answer to 3 decimal places.) b) What are the quartiles (the 25% and 75% values) of battery life? 25% value = i minutes (Round the answer to the nearest integer.) 75% value = minutes (Round the answer to the nearest integer.) c) What value of life in minutes is exceeded with 95% probability? i (Round the answer to the nearest integer.)
The time until recharge for a battery in a laptop computer under common conditions is normally distributed with mean of 270 minutes and a standard deviation of 50 minutes. a) What is the probability that a battery lasts more than four hours? i (Round the answer to 3 decimal places.) b) What are the quartiles (the 25% and 75% values) of battery life? 25% value = i minutes (Round the answer to the nearest integer.) 75% value = minutes (Round the answer to the nearest integer.) c) What value of life in minutes is exceeded with 95% probability? i (Round the answer to the nearest integer.)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Given that
X~N( μ = 27p , ? = 50 )
μ = 270 , ? = 50
Z-score =( x - μ )/?
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