A bank issues Visa and Master Cards. It is estimated that the balances on all Visa credit cards issued by the bank have mean of RM 8500 and a standard deviation of RM 2500. Assuming that the balances on all these Visa cards follow a normal distribution, (i) What is the probability that a randomly selected Visa card issued by this bank has a balance of between RM 9000 and RM 12000? (ii) What percentage of the Visa cards issued by this bank have a balance of RM 8000 or more?

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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(b)
A bank issues Visa and Master Cards. It is estimated that the balances on all
Visa credit cards issued by the bank have mean of RM 8500 and a standard
deviation of RM 2500. Assuming that the balances on all these Visa cards
follow a normal distribution,
(i)
What is the probability that a randomly selected Visa card issued by this
bank has a balance of between RM 9000 and RM 12000?
(ii)
What percentage of the Visa cards issued by this bank have a balance of
RM 8000 or more?
Transcribed Image Text:(b) A bank issues Visa and Master Cards. It is estimated that the balances on all Visa credit cards issued by the bank have mean of RM 8500 and a standard deviation of RM 2500. Assuming that the balances on all these Visa cards follow a normal distribution, (i) What is the probability that a randomly selected Visa card issued by this bank has a balance of between RM 9000 and RM 12000? (ii) What percentage of the Visa cards issued by this bank have a balance of RM 8000 or more?
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