You decide to play roulette 200 times each time betting the same amount on red. you will loe money if you win on fewer than 100
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Disregard my earlier question.
Recall that the variance of a random variable
, denoted 
, is given by
where
denotes the expected value/mean of , and 
is the actual mean of .
Now, recall that
(a)
The standard deviation is the square root of the variance, so for (a) you have
That should give you an idea as to how to figure out the rest.
Recall that the variance of a random variable
where
Now, recall that
(a)
The standard deviation is the square root of the variance, so for (a) you have
That should give you an idea as to how to figure out the rest.
15, 20, and 25 are a Pythagorean triple, (225+40=625) thus they form a right triangle. The shortest altitude of any right triangle is going to be that of the hypotenuse. All three of the right triangles formed by the altitude on hypotenuse are similar. Thus 15:25 = a:10. a=6.
