١_Let X:Ge(p=0.2) then Var(x) =20 Select one: True False ،2-Suppose X is a continuous random variable with positive valu

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١_Let X:Ge(p=0.2) then Var(x) =20
Select one:
True
False
،2-Suppose X is a continuous random variable with positive values and density equal tof left parenthesis x right parenthesis space equals space 9 x e to the power of negative 3 x end exponent space space 0 less than x less than infinity then p left parenthesis x greater than 1 right parenthesis space equals 4 e to the power of negative 3 end exponent
Select one:
True
False
3-A sales person makes “cold calls” trying to sell a product by phone and is successful on each call with probability 1/50. Whether or not he is successful is independent from one call to the next. If he calls 50 people, the number of successful calls is:
Select one:
a. exactly 1, since he called 50 people and the probability of success is 1/50 each time
b. equally likely to be 0, 1 or 2.
c. at most 1, because once he has been successful he can’t be successful again in the 50 calls.
d. a binomial random variable
4-Suppose that in a large population, the proportion that is left-handed is p = 0.10. Suppose n = 20 people will be randomly selected and X = number of people in the sample who are left-handed. What probability model should be used to find the probability that X = 3?
Select one:
a. chi-square
b. Normal
c. Binomial
d. Uniform