Suppose that the length of long distance phone calls, measured in minutes, is known to have an exponential distribution with the average length of a call equal to $18 minutes. The lambda of this distribution is The probability that the length of a phone call is longer than 22 is P(x ≥ 22) = The probability that the length of a phone call is shorter than 12 is P(x ≤ 12) =

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter5: Exponential And Logarithmic Functions
Section5.5: Exponential And Logarithmic Models
Problem 4ECP
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Suppose that the length of long distance phone calls, measured in minutes, is known to have an exponential distribution with the average length of a call equal to $18 minutes.

  1. The lambda of this distribution is
  2. The probability that the length of a phone call is longer than 22 is P(x ≥ 22) =
  3. The probability that the length of a phone call is shorter than 12 is P(x ≤ 12) =
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