Answered: 1.The Rockwell hardness X of certain…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Question

1.The Rockwell hardness X of certain metal pins is known to have a mean of M = 50 and a standard deviation 0 = 4

Assume that the distribution of all such pin hardness measurements is known to be normal.

Suppose a pin is randomly selected from the population. What is the probability that the hardness of this pin is less than 46? That is, what is the probability P(X < 46)?

Choices:

0.3085

0.0228

0.0

0.01587

0.8413

0.0668

2.Assume T is a random variable representing time, with an exponential

distribution and a mean of 21.

Find the probability P(T <= 21).

3.The wait times at a clinic are exponentially distributed with a mean wait time

of 40 minutes.

What is the median wait time at the ER?

Choices:

19.45 minutes

40 minutes

44 minutes

27.73 minutes

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

Expert Solution