I am looking for some tutoring in the following problems -- please answer.
Thanks.

56. The weights (in pounds) of a sample of five boxes being sent by
UPS are: 12, 6, 7, 3,
and 10.
a. Compute the range.
b. Compute the mean deviation.
c. Compute the standard deviation.
 

20. The following chart shows the selling price ($000) of houses sold
in the Billings, Montana,
area.


Selling price ($000s)	Frequency	Percent

0			0		0	
50			20		15
100			25		20
150			60		35
200			125		55
250			165		85
300			200		95
350			205		100


a. How many homes were studied?
b. What is the class interval?
c. One hundred homes sold for less than what amount?
d. About 75 percent of the homes sold for less than what amount?
e. Estimate the number of homes in the $150 up to $200 class.
f. About how many homes sold for less than $225?


Thanks!