A contractor estimates the probabilities for the number of days required to com- plete a certain type of construction project as follows: Time (days) 1 2 3 4 5 Probability 0.05 0.2 0.35 0.2 0.35 0.3 0.1 a) What is the probability that a randomly chosen project takes less than 3 days to complete? b) Find the expected time to complete the project. c) Find the standard deviation of the time required to complete the project.

A contractor estimates the probabilities for the number of days required to com- plete a certain type of construction project as follows: Time (days) 1 2 3 4 5 Probability 0.05 0.2 0.35 0.2 0.35 0.3 0.1 a) What is the probability that a randomly chosen project takes less than 3 days to complete? b) Find the expected time to complete the project. c) Find the standard deviation of the time required to complete the project.

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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