Question 1042200
2. Using the following frequency table for a class of Beginning Algebra students’ test scores, 
exam score	70	74	78	82	86	90	96	100
frequency	6	6	4	1	6	5	5	2 
Multiply each score number by its frequency
Totals.........420......444.....452.....82......516.....450.....480.....200

calculate the following:
a) average Add those "Total" numbers and divide by the sum of the frequency numbers to get:: 74.68___ 
b) 25th percentile = 	0.25*35 = 8.75 = the 9th element is order = 74
--------------------------------------------------------- 
c) median is the middle score or aver of 17th and 18th = (82+86)/2 = 84
78d) 75th percentile  = 0.75*35 = 27th element = 9
e) 40th percentile  = 0.4*35 = 14 element = 78_________ 
f) 80th percentile = 96_________
Note: Some would say the answer to "f" is 90.  Depends on how
you define percentile.
Cheers,
Stan H.