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# The usage time of a telephone belonging to a specific brand may be looked upon as a random variable having normal distribution with a mean of 20 years and a varianc...

## Question

###### The usage time of a telephone belonging to a specific brand may be looked upon as a random variable having normal distribution with a mean of 20 years and a variance 4 years: What is the probability that a randomly selected telephone will be used between 15 and 18 years?

The usage time of a telephone belonging to a specific brand may be looked upon as a random variable having normal distribution with a mean of 20 years and a variance 4 years: What is the probability that a randomly selected telephone will be used between 15 and 18 years?  #### Similar Solved Questions

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Section 6.5 Impulse Function: Problem 1 Previous Problem List Next point) Use the Laplace transform to solve the following initial value problem: y" 8y' 9y = 8(t _ 9) y(0) = 0, y (0) = 0 y(t) (Notation: write u(t-c) for the Heaviside step function Uc(t) with step at t = â‚¬ )...
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##### QUESTION 7which of the following most accurately describes Independent versus dependent samples?Independent samples Participants or individuals independently 'undergo invasive dangerous medical treatments within research studiesDependent samples= The assignment of individuals treatment groups within research studies depends on the type of procedure_ being tested within the study (i.e- from most east invasive)Independent samplesdifferent treatment groups that are usually formed by the random
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##### HN 978 #! 1 1 6 V HN I | 3 2 # W 2 1 V H 1 1 FO 8 H li H [ 16 9 ] J1j V 2 1 7 1 h [ #| [ 2 I 0=0 I 3 | OFO 1 2 2 1 17 2 O=0 0 0 1 2 1 M 1 !
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