1Bar graphs help readers see the changes that have occurred over a period of tim

Question

1Bar graphs help readers see the changes that have occurred over a period of time. Let’s take our computer consultant example and make a vertical bar graph out of the data with the X axis being the Price of computers

2.Barton Company’s sales reps sold the following last month: Sales rep Sales volume A $16,500 B 15,000 C 12,000 D 48,900

1.Calculate the mean,

2.median, and

3.standard deviation for the sales data.

4.What is the meaning of a standard deviation that is 2 deviations from the mean.

*Please be detailed I like to see where the answer is coming from.

Explanation / Answer

1.The mean is:

(16500+...+48900)/4

=23100

2.Arrange the data in ascending order:

12000,15000,16500,48900

The median is (15000+16500)/2=15750

3.The standard deviation is:

root over sum over (xi-x bar)^2/n-1

=root over[(16500-23100)^2+...+(48900-23100)^2]/3

=17301.44

4.The meaning a standard deviation that is 2 deviations from the mean is:

23100-2*17301.44=-11502.88

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