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Sally gets a cup of coee and a mun every day for breakfast
Chapter , Problem 2.41(choose chapter or problem)
Sally gets a cup of coffee and a muffin every day for breakfast from one of the many coffee shops in her neighborhood. She picks a coffee shop each morning at random and independently of previous days. The average price of a cup of coffee is $1.40 with a standard deviation of 30¢($0.30), the average price of a muffin is $2.50 with a standard deviation of 15¢, and the two prices are independent of each other.
(a) What is the mean and standard deviation of the amount she spends on breakfast daily?
(b) What is the mean and standard deviation of the amount she spends on breakfast weekly (7 days)?
Questions & Answers
QUESTION:
Sally gets a cup of coffee and a muffin every day for breakfast from one of the many coffee shops in her neighborhood. She picks a coffee shop each morning at random and independently of previous days. The average price of a cup of coffee is $1.40 with a standard deviation of 30¢($0.30), the average price of a muffin is $2.50 with a standard deviation of 15¢, and the two prices are independent of each other.
(a) What is the mean and standard deviation of the amount she spends on breakfast daily?
(b) What is the mean and standard deviation of the amount she spends on breakfast weekly (7 days)?
ANSWER:
Step 1 of 4
Average price of a cup of coffee = $1.40.
The standard deviation of a cup of coffee = $0.30
Average price of a muffin = $2.50.
The standard deviation of a muffin = $0.15.
It’s also given that she picks a coffee shop each morning at random and independently of previous days.