I am having so much trouble doing these, if someone could help I would appreciate it.

Construct a percentile graph for the data below. Approximate to the nearest 10th the data value that corresponds to the 75th percentile. Lower bound upper bound Frequency
9.5 15.5 7
15.5 21.5 4
21.5 27.5 5
27.5 33.5 2
33.5 39.5 2

a. 40.5
b. 16.1
c. 23.5
d. 26.3



Find the estimate of the mean for the following grouped frequency distribution.
lower limit upper limit frequency

10 15 7
16 21 4
22 27 5
28 33 2
34 39 2


Examine the following stem and leaf display. What is the median for the data set?

4 2 5 8
5 1 1 2 5 7
6 0 0 1 5 6 6 9
7 0 1 2 4 6 8
8 1 3 5 7


Construct a percentile graph for the data below. Approximate to the nearest 10th the data value that corresponds to the 75th percentile.
lower bound upper bound Frequency

9.5 15.5 7
15.5 21.5 4
21.5 27.5 5
27.5 33.5 2
33.5 39.5 2

a, 40.5
b. 16.1
c. 23.5
d. 26.3


Many, many thanks in advance
Karen