Matlab:

b. & c. are the ones I need help in

Consider the following data points

155,142,149,130,151,163,151,142,156,133,138,161,128,144,172,137,151,166,147,163,145,116,136,158,114,165,169,145,150,150,150,158,151,145,152,140,170,129,188,156

a. Construct a frequency distribution with eight calsses. Begin with a lower class limit 110, and use a class width of 10

b. Construct a frequency polygon for the given set of data. For the horizontal axis, use the midpoints of the classes in part a. (115,125,135,145,155,165,175,185,195? I'm guessing)

c. Construct an ogive plot (accumulated frequency plot) for the given set of data.