Answered: A project company hired 800 casual…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.5: Comparing Sets Of Data

Problem 2CYU

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Question

A project company hired 800 casual employees to undertake a major housing project. On average (daily basis) these workers take 8 hours to complete a given task with a s.d deviation of 2 hours. If completion time is normally distributed, determine the no. of workers who completed the task in: -

Between 14.4 hours and 14.8 hours

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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