a) the 65th percentile; b) the 4th decile; c) the first quartile; d) the median; e) percentile rank of a value of 15. Class Interval Frequency 0 to under 10 4 10 to under 20 6 20 to under 30 10 30 to under 40 40 to under 50 50 to under 60 60 to under 70