I am having trouble with these questions. Need help ASAP

Consider the given discrete probability distribution: x 3 5 7 9 P(x) 0.24 ? 0.26 0.01 Find the probability that x is at least 5. O 0.73 O 0.27 o 0.49 O 0.76 A local bakery has determined a probability distribution for the number of Cheesecakes it sells in a given day. The distribution is as followed: Number sold in a day 0 5 10 15 20 Prob (Number sold) 0.21 0.15 0.06 0.07 0.51 Find the number of Cheesecakes that this local bakery expects to sell in a day. O 12.81 0 12.6 010 020 In a population of students, the number of calculators owned is a random variable X with P(X=0) = 0.2, P(X=1)=0.6, and P(X=2)=0.2. Then the variance of this population is O 0.63 O 0.4 O 1 O 0.5