The time (in minutes) between telephone calls at an insurance claims
office has the exponential probability distribution:
f(x) = 0.80e-0.80z
a. What is the mean time between telephone calls?
Mean time (u) =
P(x ≤ 0.60) =
b. What is the probability of 36 seconds or less between telephone
calls? (Note: 36 seconds = 0.60 minutes) If required, round your
answer to four decimal places.
for x 20
14 X n Incorrect
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c. What is the probability of 3 minute or less between telephone calls?
If required, round your answer to four decimal places.
P(x ≤ 3) =
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.0025 X
d. What is the probability of 6 or more minutes without a telephone
call? If required, round your answer to four decimal places.
P (x ≥ 6) = 0.4512 X