The mean of the data set is 15. what is number is missing. 18, 16, 9, 12, 23

Name the most appropriate metric unit for each measurement

Use the frequency distribution, which shows the number of american voters (in millions) according to age, to find the probability that a voter chosen at random is in the 18 to 20 years old age range. ages frequency 18 to 20 5.9 21 to 24 7.7 25 to 34 20.4 35 to 44 25.1 45 to 64 54.4 65 and over 27.7 the probability that a voter chosen at random is in the 18 to 20 years old age range is nothing. (round to three decimal places as needed.)

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?