Posted by **Jake** on Wednesday, June 2, 2010 at 5:59pm.

The Sarasota Police department collected data on the number of car accidents ( X ) that occur each day on a certain stretch of route 41. From this data, they derived the probability distribution shown in the table below.

X P(X)

0 0.80

1 0.15

2 0.05

What is the expected mean (average) number of accidents that occur each day

- STATISTICS -
**MathGuru**, Friday, June 4, 2010 at 7:05pm
To find the mean:

SUM [x * P(x)]

Multiply each x by its respective probability P(x). Add together for a total. This will be your mean.

To find variance:

SUM [x^2 * P(x)] - mean^2

Square each x. Multiply each squared x by its respective probability P(x). Add together for a total. Square the mean. Subtract the squared mean from the total. This will be your variance.

To find standard deviation:

Take the square root of the variance.

Hopefully, this information will help you with problems of this type.

- STATISTICS -
**blueyeshadow**, Monday, January 17, 2011 at 8:11pm
answer is 0.33

- STATISTICS -
**dennis**, Wednesday, December 19, 2012 at 2:42pm
1 to 6264. find the probability of selecting a number that is not divisible by 1000

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