The answer is 2. I hope this helped.
Answer:
19
Step-by-step explanation:
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21
Answer:

Step-by-step explanation:
For this case we want to find this probability:

Because they want the area to the left of the value. We need to remember that the normal standard distribution have a mean of 0 and a deviation of 1.
We can use the following excel code: =NORM.DIST(-1.55,0,1,TRUE)
And we got:

The other possibility is use the normal standard table and we got a similar result.
Answer:
Step-by-step explanation:
3*n*p*6 = 18np
Answer:
The number of ordered arrangements of n objects taken r at a time.
Step-by-step explanation: