Please workout b

The following stem-and leaf display of the dividend yields ($) for common stocks
Stem-and-Leaf Display
           N = x                                      Leaf Unit = 1.0
5         2     33444
11  2        668899

(14)    3       00112223344444
y         3     56778899
12       4     0002344

5         4     66789

i. Determine the value of x and y. 
ii. What is the value of the median? 
iii. Find the modal yield of this data set.

(b) The table below is based on the Stem and leaf diagrams showing dividend yields ($) for common stocks

Use the stem and leaf diagram in 3a) to determine the value of x. 
ii. Using the table above to calculate
a) the sample mean of the dataset.
b) the mode of the dataset. 
c) the sample variance of the dataset.