11. The Median and Mode of the following wage distribution are known to be Rs.33.50 and Rs.34 respectively .Find the values of f3, f, and fs Wages: 0-10 10-20 20-30 30-40 40-50 50-60 60-70 Total Frequency(in Rs.) 4 16 f3 fA 6 4 230 12. Find M.G.F of Exponential distribution. Obtain imean and Variance using Moment generating function.4. Define the following random variables and write their probability mass function and probability density function. (a) Binomial random variable. (b) Poisson random variable. (c) Exponential random. (d) Normal random variable