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Itions. Direction: Find the mean, variance, and standard deviation of the following probability distribution then interpret the computed values. Write your answers in your YELLOW PADPAPER. 1. Variable z representing the number of male teachers per Secondary school. Z 7 8 9 10 P(Z) 11 12 30% 30% 13% 10% 7% 10% 2. The number of mobile phones sold per day at a retail store varies as shown in the given probability distribution below. Find the expected number of mobile phones that will be sold in one day. X 30 33 38 40 50 P(x) 0.2 0.2 0.35 0.23 0.02 3. The number of inquiries received per day by the office of Admission in SHS X last enrolment is shown below. Number of Inquiries X Probability P(x) 22 0.08 25 0.19 26 0.36 28 0.25 29 0.07 30 0.05