A National Study Found That the Average Family Spent $422

A national study found that the average family spent $422 a month on groceries, with a standard deviation of $84. The average amount spent on housing (rent or mortgage) was $1120 a month,
With standard deviation $212. The expected total a family spends on food and housing is 422 + 1120= $1542. What is the standard deviation of the total?

A) $295
B) $128
C) $148
D) $228
E) It cannot be determined.

Correct Answer:

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