Question

The number of cars sold at a dealership over several weeks is given below. 14, 23, 31, 29, 33 What is the standard deviation for this set of population data? Standard deviation: mc005-1.jpg

Answer 1

Answer:

The answer is A.6.9.

Step-by-step explanation:

Answer 2

Answer:

7.6811

Step-by-step explanation:

Given that is a sample of size 5, with readings as

14, 23, 31, 29, 33

Sum = 130:  Hence mean = 130/5 =26

Let us find for each entry x the value x-26

X               14    23     31    29    33

(x-26)^2     144   9     25    9    49

Hence variance = average of $(x-26)^2== \frac{236}{5} =47.20$

Std dev =$\sqrt{47.2}$

Population std dev = Sample std dev/sq rt (n-1)

=$\frac{\sqrt{47.2} }{\sqrt{5-1} } \\=7.6811$