Please help I don’t have much time!!

Question

Find the mean and standard deviation for the set of data

{18, 16, 6, 13, 5, 15, 24, 17, 21}

A. Mean: 15; standard deviation: 6.01

B. Mean: 16; standard deviation: 6.01

C: Mean: 15; standard deviation: 5.93

D. Mean: 16; standard deviation: 5.93

Answer 1

The mean is the average number of numbers. To calculate: add up all the numbers, then divide by how many numbers there are.

Therefore:

(18+16+6+13+5+15+24+17+21)/9 = 15

The standard deviation is a measure of how spread out numbers are. To calculate:

x are the data numbers provided in the question {18, 16, 6, 13, 5, 15, 24, 17, 21}.

x̄ is the mean which is 15 as calculated above.

n is 9.

Therefore:

√(18-15)²+(16-15)²+(6-15)²+(13-15)²+(5-15)²+(15-15)²+(24-15)²+(17-15)²+(21-15)²)/ √(9)=

2√(79)/3=

5.925=

5.93

Hence, your answer is D. Mean: 16; standard deviation: 5.93

Answer 2

Per MS EXCEL,

the mean is 15

the standard deviation is

I guess option A is your best bet