Question

a. i. Cash reward will be given to a user when his/her amount of expenditure during the first 3 months exceeds $33,800. Calculate the probability that a randomly selected user will not have the cash reward. ii. Determine the amount of expenditure that only 10% of the users have their amounts below it. iii. Eighty users are randomly selected. Calculate the probability that at most three quarters of them have the amount of expenditure below $30,800. iv. Nine users are randomly selected. Calculate the probability that their total amount of expenditure is above $216,000. b. From records, there are 0.4% bad-debt accounts. An accounting clerk randomly selects 10,000 accounts, calculate the probability that there are 39, 40, or 41 bad-debt accounts.

          a. 
i. Cash reward will be given to a user when his/her amount of expenditure during the first 3 months exceeds $33,800. Calculate the probability that a randomly selected user will not have the cash reward.
ii. Determine the amount of expenditure that only 10% of the users have their amounts below it.
iii. Eighty users are randomly selected. Calculate the probability that at most three quarters of them have the amount of expenditure below $30,800.
iv. Nine users are randomly selected. Calculate the probability that their total amount of expenditure is above $216,000.

b. From records, there are 0.4% bad-debt accounts. An accounting clerk randomly selects 10,000 accounts, calculate the probability that there are 39, 40, or 41 bad-debt accounts.

Added by Todd H.

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