# I'm not understanding the wording

#### begonia

##### New Member
9000000 trials next year
n=9000000
p=.0000004 (per empirical prob)

and I made a prob distribution and a histogram for x=1-10 (x being a success)

then the project asks me to find the mean and standard deviation for the number of successes in a year

do I just compile this from my P(x) column?

E

#### elnaz

##### Guest
Hello
if the number of your trails in a year is certain then the number of successes in a year has binomial distribution because , the number of successes in a year will have been the number of successes in total of your trails, so you can find mean and std .