# Question: Let X the number of living grandparents that a

Let X = the number of living grandparents that a randomly selected adult American has. According to recent General Social Surveys, its probability distribution is approximately P(0) = 0.71, P(1) = 0.15, P(2) = 0.09, P(3) = 0.03, P(4) = 0.02.

a. Does this refer to a discrete or a continuous random variable? Why?

b. Show that the probabilities satisfy the two conditions for a probability distribution.

c. Find the mean of this probability distribution.

a. Does this refer to a discrete or a continuous random variable? Why?

b. Show that the probabilities satisfy the two conditions for a probability distribution.

c. Find the mean of this probability distribution.

**View Solution:**## Answer to relevant Questions

Let X represents the number of homes a real estate agent sells during a given month. Based on previous sales records, she estimates that P(0) = 0.68, P(1) = 0.19, P(2) = 0.09, P(3) = 0.03, P(4) = 0.01, with negligible ...For a normal distribution, find the probability that an observation is a. Within 1.96 standard deviations of the mean. b. More than 2.33 standard deviations from the mean. A study of water use in Gainesville, Florida, indicated that in 2006 residential water consumption had a mean of 78 and a standard deviation of 119, in thousands of gallons. a. If the distribution of water consumption were ...In one Canadian lottery option, you bet on one of the million six-digit numbers between 000000 and 999999. For a $1 bet, you win $100,000 if you are correct. In playing n times, let X be the number of times you win. a. Find ...The National Center for Educational Statistics reported that in 2009 the ACT college placement and admission examination had a mean of 21.1 and standard deviation of 5.1. (Source: Data from ...Post your question