Answer
a. Q1 = 69, Q2= 73， Q3=76.5
b. Percentile(35th)= 71
c. Percentile rank = 30.77%
Work Step by Step
a)
Q2 = median = 7th = 73,
$Q1 = (69+69)\div2 = 69, $
$Q3 = (76+77)\div2 = 76.5$
b)
Percentile (35th) = $(35\times13)\div100 = 4.55\approx 5th = 71$
c) Percentile rank $(x < 71)= 4\div13\times100 = 30.77%$
