Question

The customer accounts of a certain departmental store have an average balance of
Rs.1200 and a standard deviation of Rs.400. Assuming that the account balances are
normally distributed. (i) what percentage of the accounts is over Rs.1500? (ii) What
percentage of the accounts is between Rs.1000 and Rs.1500? iii) What percentage of the
accounts is below Rs.1500?

Answer 1

Answer:

Step-by-step explanation:

Suppose, Amit's income is 100, then Rahul's income is 125.

Rahul's income is 25% more than Amit's.

Amit's income is (125-100)/125*100 % less than Rahul's.

That is 20%.