Question

a random number generator was used to resample the group. use the new table below to answer the questions.

	cholesterol in mg/dl
new treatment	225	248	221	242	235	246	250	224	241	242

what is the mean of the new treatment group? round to the nearest tenth.
a. 234.4
b. 237.4
c. 235.9
d. 242.5

Explanation:

Step1: Recall mean formula

The mean $\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}$, where $x_{i}$ are the data - points and $n$ is the number of data - points.

Step2: Identify data and $n$

The new treatment group data is $225,248,221,242,235,246,250,224,241,242$. Here $n = 10$.

Step3: Calculate the sum

$\sum_{i=1}^{10}x_{i}=225 + 248+221+242+235+246+250+224+241+242$
$=2374$.

Step4: Calculate the mean

$\bar{x}=\frac{2374}{10}=237.4$.

Answer:

B. 237.4