The probability that your call to a service line is answered in less than 30 seconds is 0.75. assume that your calls are independent. (a) if you call 11 times, what is the probability that exactly 9 of your calls are answered within 30 seconds? round your answer to four decimal places (e. g. 98.7654). (b) if you call 20 times, what is the probability that at least 16 calls are answered in less than 30 seconds? round your answer to four decimal places (e. g. 98.7654). (c) if you call 26 times, what is the mean number of calls that are answered in less than 30 seconds? round your answer to the nearest integer.

Answer with Step-by-step explanation:

Since the given event is binary we can use Bernoulli's probability to sove the problem

Thus for an event 'E' with probability of success 'p' the probability that the event occurs 'r' times in 'n' trails is given by

Part a)

For part a n = 11 , r =9, p = 0.75

Applying values we get

Part b)

For part b n = 20 , r = 16 , p=0.75

Applying values we get

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

mark brainliest!

b. hannah is playing with her cousin at