The average age of three groups of people is : Group x = 11 years,
Group y = 27 years,
Group z = 51 years,
Group x and y = 17.2 years and
Group y and z = 32.6 years.
Find the average age of all the three groups.

According to a study done by de anza students, the height for asian adult males is normally distributed with an average of 66 inches and a standard deviation of 2.5 inches. suppose one asian adult male is randomly chosen. let x = height of the individual. a) give the distribution of x. x ~ b) find the probability that the person is between 64 and 69 inches. write the probability statement. what is the probability?