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The customer accounts at a certain departmental store have an average balance of Rs. 480 and a standard deviation of Rs. 160. Assuming that the

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The customer accounts at a certain departmental store have an average balance of Rs. 480 and a standard deviation of Rs. 160. Assuming that the account balances are normally distributed.

(a) What proportion of the accounts is over Rs. 600?

(b) What proportion of the accounts is between Rs. 240 and Rs. 360?

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