Question

The mean amount spent by a family of four on food per month is $390 with a standard deviation of $150. Assuming that the food costs are normally distributed, what is the probability that a family spends more than $500 per month?

Wrong Answer:	0.7683
Answers:	0.7683
	0.9374
	0.0626
	0.2317

Answer 1

µ =    390              
σ =    150              
                  
P ( X ≥   500.00   ) = P( (X-µ)/σ ≥ (500-390) / 150)          
= P(Z ≥   0.733   ) = P( Z <   -0.733   ) =    0.2317

option (d)

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