Question

(1 point) A recent poll suggests that 62% of Canadians use their mobile device to comparison shop while they are in a store. You are to randomly pick 4 Canadians from a population made up of people who have a mobile device. You ask each the question: Do you use your mobile device to comparison shop while you are in a store? The number who respond 'yes" is counted and represented by the random variable X. Its probability distribution is given below. X 0 1 2 3 4 P(X = x) 0.0209 0.1361 0.333 0.36230.1478 (a) What can you say about the tendency of X? Pick all that apply. A. The probability distribution of X is perfectly symmetric. B. The probability distribution of X is right-skewed. c. X is more likely to take on larger rather than smaller values. D. X is more likely to take on smaller rather than larger values. E. The probability distribution of X is left-skewed. (b) Find the expected value, or mean, of X. E(X) = x = (use two decimals in your answer) (c) Find the standard deviation of X. SD(X) = Ox = (use two decimals your answer)

Answer 1

X is more likely to take larger values. As the probabilities for X= 2,3,4 is higher than 0 or 1

The probability distribution of X is Left skewed . Because the maximum probabilities are at the right end .