(18 points) The following is the number of passengers per flight in a sample of 34 flights from Ottawa, Ontario, to Hampton, Washington in 2018.

78 73 75 99 50 58 25 56 57 55 59 55 62 69 77 66 51 21 53 30 51 63 52 57 68 75 66 65 69 79 72 65 53 50.

Find the percentage of measurements falling in the intervals xks for k = 1, 2, 3.