Wednesday

April 16, 2014

April 16, 2014

Posted by **George** on Thursday, October 11, 2012 at 12:04pm.

Accidents 0,1 2 Probability .5, ?, .2

P(X=1) =

E(x) = µx =

Standard deviation =

- Stats -
**MathGuru**, Thursday, October 11, 2012 at 7:10pmNote: Your ? value should be .3 because each probability will then add to 1.

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 other problems of this type.

**Related Questions**

Finance - I need help on this study problem.----- A firm computes the ...

Chemistry/Normal Distributions/Math - I'm confused on how to calculate the ...

Stats - The director of admissions at Kinzua University in Nova Scotia estimated...

Business Statistic - X f(x) 0 .25 1 .20 2 .15 3 .30 4 .10 Is it prpbsbility ...

math - Suppose x is a random variable with mean and standard deviation. If a ...

stATS - the standard deviation of the sampling distribution of the means is ...

psy Stats. - how do you Calculate percentage when given standard deviation and ...

STATS - In a certain store, there is a .05 probability that the scanned price in...

stats & prob. - Given the values of n=5, p= 0.15, and (1-p)=0.85, calculate the ...

stats - Why must you square the deviation scores when computing a standard ...