Posted by **Paula** on Saturday, April 9, 2011 at 1:41pm.

A salesperson has found that the probability of making various numbers of sales per day is presented in the following table. Calculate the expected number of sales per day and the standard deviation of the number of sales.

Number of sales(Probability)

1(0.05) 2(0.16) 3(0.20) 4(0.25) 5(0.18) 6(0.10) 7(0.04) 8(0.02)

- statistics -
**PsyDAG**, Sunday, April 10, 2011 at 12:15pm
Find the mean first = sum of scores/number of scores

Sum of scores = (.05) + 2(.16)... + 8(.02) = ?

Number of scores = 1 + 2 + 3... + 8

Subtract each of the scores (.05, .16, .16, .2, .2, .2....) from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

I'll let you do the calculations.

## Answer this Question

## Related Questions

- Probability - A salesperson contacts eight potential customers per day. From ...
- stat - Problem 2. THE PROBABILITY THAT A RANDOMLY CHOSEN SALES PROSPECT WILL ...
- Statistics - 1. A company decides to add a new program that prepares randomly ...
- statistics - a company decides to add a new program that prepares randomly ...
- statistics - 1. A company decides to add a new program that prepares randomly ...
- Statistics - The daily sales of a retail store are normally distributed with a...
- statistics - The daily sales of a retail store are normally distributed with a ...
- math - THE MAXIMUM NUMBER OF CUSTOMERS ARRIVING DURING RANDOMLY CHOSEN 10-MIN ...
- Statistics - Cellular Phone Sales The probability that a cellular phone company ...
- Psychology - 1. A company decides to add a new program that prepares randomly ...

More Related Questions