HMATH12 Activity # 3 1.29 22:22 Chapter 3 Probability distributions Solve the following: 1. The Movies and Television Regulatory and Classification Board (MTRCB) determined the number of commercials shown in each of the four night programs over a period of 20 time. Find the mean. variance and standard deviation for the distribution below. No. of Commercials (x) 10 1 1 12 13 Probability P(x) 0.15 0.35 0.30 0.20 2. The RFS Electronics sells iphones for Apple Inc. RFS usually sells the number of iphones on Sunday. The store manager established the following probability distribution for the number of Iphones the store expects to sell on a particular Sunday. No. of Iphones (x) 0 2 3 4 5 Probability P(x) 0.05 0.10 0.12 0.15 0.18 0.40 How many Iphones should the store manager expect to sell? What is the variance and standard deviation of the distribution? Referen