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Question 1
An Adweek Media / Harris Poll revealed that 44 % of U . S . adults in the 18 – 34 years category think that “ Made in America ” ads boost sales . A different Harris Interactive poll showed that 78 % of U . S . adults in the 18 – 34 years category use social media online . Suppose that 85 % of U . S . adults in the 18 – 34 years category think that “ Made in America ” ads boost sales or use social media online .
If a U . S . adult in the 18 – 34 years category is randomly selected
a . Whatistheprobabilitythatthepersonthinksthat “ MadeinAmerica ” ads boostsalesanduses social media online ?
b . What is the probability that the person thinks that “ Made in America ” ads boost sales given that the person does not use social media online ?
Question 2
According to a report by Scarborough Research , the average monthly household cellular phone bill is $ 73 . Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $ 11.35 .
a . What is the probability that a randomly selected monthly cell phone bill is more than $ 100 ?