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 ?
Answer:
15.766
Step-by-step explanation:
17 menos 1.234 es 15
15.38. 7, the number in the hundredths place, is turned into 8 due to the following digit, 5. Since it is equal to the minimum, 5, the previous number is rounded up.
B = 7, a = 5. So a + b is 13.