An independent third party found the cost of a basic car repair service for a local magazine. The mean cost is $217.00 with a standard deviation of $11.40. Which of the following repair costs would be considered an “unusual” cost?
A.
$233.87
B.
$221.65
C.
$192.53
D.
$197.24

Question

07-07-2017
Mathematics

contestada

An independent third party found the cost of a basic car repair service for a local magazine. The mean cost is $217.00 with a standard deviation of $11.40. Which of the following repair costs would be considered an “unusual” cost?
A.
$233.87
B.
$221.65
C.
$192.53
D.
$197.24

Respuesta :

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meerkat18 meerkat18 · Answer 1 · 2017-07-20T14:11:12+02:00

In this problem, the approach to solve the unusual value is to assume that the distribution used is a normal distribution. A normal distribution assumes that the mean is equal to zero, the area under the curve is 1 and that the standard deviation is equal to 1. In this case, we use the given mean and standard deviation to determine their corresponding ranges.

First range: mean +- SD
x1 = 217 + 11.4 = 228.4
x2 = 217 - 11.4 = 205.6
This only eliminates one option hence we move next to 2SD

Second range: mean +-2SD
x1 = 217 + 2*11.4 = 239.8
x2 = 217 -2*11.4 = 194.2

This leaves option C not included in this range, hence C is the answer to this problem.

An independent third party found the cost of a basic car repair service for a local magazine. The mean cost is $217.00 with a standard deviation of $11.40. Which of the following repair costs would be considered an “unusual” cost? A. $233.87 B. $221.65 C. $192.53 D. $197.24

Respuesta :

Otras preguntas

An independent third party found the cost of a basic car repair service for a local magazine. The mean cost is $217.00 with a standard deviation of $11.40. Which of the following repair costs would be considered an “unusual” cost?
A.
$233.87
B.
$221.65
C.
$192.53
D.
$197.24