Question 21Students guess that Norb’s age is $24,$ $28,$ $30,$ $32,$ $36,$ $38,$ $41,$ $44,$ $47,$ and $49.$ Norb says, “At least half of you guessed too low, two of you are off by one, and my age is a prime number.” How old is Norb?$29$$31$$37$$43$$48$