Answer:
And the deviation would be:
Step-by-step explanation:
For this case we have the following distribution given:
X 0 1 2 3 4 5 6
P(X) 0.3 0.25 0.2 0.12 0.07 0.04 0.02
For this case we need to find first the expected value given by:
And replacing we got:
Now we can find the second moment given by:
And replacing we got:
And the variance would be given by:
And the deviation would be:
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➷ 75/10^1 = 7.5
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Answer:
1/24
Step-by-step explanation:
This is a mutually exclusive event.
There are four possible floors and four people.
The probability that the first floor is selected is 1/4
The same probability exists for the second floor and the third and the fourth.
So, the probability of all four people choosing different floors is 1/4 * 1/4 * 1/4 * 1/4 = 1/24
Lna^b = blna
let y = lne^e
so y = lne^e = e lne
lne = 1
y = e which is a constant (Euler's number) ~= 2.718
For Euler's number estimating methods request in a comment.