The closing stock price of Ahmadi, Inc. for a sample of 10 trading days is shown below.

Day	Stock Price
1	83
2	77
3	81
4	88
5	75
6	90
7	91
8	86
9	93
10	86

For the above sample, compute the following measures.

a. The mean

b. The median

c. The mode

d. The range