Need the whole solution. TIA

Live 2. The diagram below shows a probability density function for the return from an investment in share X. Probability Density 3 2 -10 -5 0 5 10 15 20 25 30 35 40 Return % a) Is this a normal distribution? b) What is the expected value of the return from investing in share X? c) What is the probability that share X will give a return of exactly 20%? K d) What is the probability share X will give a return within the range 5% to 14:54