The average retail price of gasoline (alltypes) for the first half of 2005 was 212.2 cents. What would the standard deviation have to be in order for a 15% probability that a gallon of gas costs less than $ 1.80?
The average retail price of gasoline (alltypes) for the first half of 2005 was 212.2 cents. What would the standard deviation have to be in order for a 15% probability that a gallon of gas costs less than $ 1.80?
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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both questions please. thank you!
Transcribed Image Text:The average retail price of gasoline (alltypes) for the first
half of 2005 was 212.2 cents. What would the standard
deviation have to be in order for a 15% probability that a
gallon of gas costs less than $ 1.80?
The average time for a mail carrier to cover a route is 380
minutes, and the standard deviation is 16 minutes. If one
of these trips is selected at random, find the probability
that the carrier will have the following route time. Assume
the variable is normally distributed:
(a) At least 350 minutes
(b) At most 395 minutes
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