The income of group of 20,000 persons was normally distributed with mean Rs 5,000 and standard deviation Rs 400.

a.

Find the expected number of persons having income greater than Rs 6,000.

b. Find the percentage of person having income between Rs 4,500 and R$ 6,000.c. Find the highest income of poorest 25% of persons.

asked by guest
on Nov 26, 2024 at 1:30 am



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