The probability can be modeled using the following formula:

wherein X follows the density

Now for k = 3 we get:
The probability we are looking for is 0.15.
Do you have any question ?
706286 to the nearest ten thousand is 706,000
C because it would be 13 x 3 and then you would take that result and times it by 3 and so on and so on and this eventually after 10 hours results to C
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I thing the answer is 75 I may be wrong but that’s what I got