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According to an NRF survey conducted by BIGresearch, the average family spends about $237 on electronics...

According to an NRF survey conducted by BIGresearch, the average family spends about $237 on electronics (computers, cell phones, etc.) in back-to-college spending per student. Suppose back-to-college family spending on electronics is normally distributed with a standard deviation of $54. If a family of a returning college student is randomly selected, what is the probability that:

(a) They spend less than $145 on back-to-college electronics?
(b) They spend more than $390 on back-to-college electronics?
(c) They spend between $125 and $190 on back-to-college electronics?

(Round the values of z to 2 decimal places. Round your answers to 4 decimal places.)

(a) P(x < 145) = enter the probability that they spend less than $145 on back-to-college electronics
(b) P(x > 390) = enter the probability that they spend more than $390 on back-to-college electronics
(c) P(125 < x < 190) = enter the probability that they spend between $125 and $190 on back-to-college electronics
math   Statistics-And-Probability   
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