What is the probability in given context

Reference no: EM131404269

For the normal distribution described in given Exercise, what is the probability that a randomly selected tax preparation customer would have paid a fee
a. between $70 and $80?

b. under $60?

c. over $90?

Exercise
In 1999, the average charge for tax preparation by H&R Block, Inc. was $84.57. Assuming a normal distribution and a standard deviation of , what proportion of H&R Block's tax preparation fees were
a. more than $84.57?

b. between $64.57 and $104.57?

c. between $74.57 and $94.57?

d. more than $104.57?

Reference no: EM131404269

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