Using it's concept, the standard deviation of the data is of 3.742.
<h3>What are the mean and the standard deviation of a data-set?</h3>
- The mean of a data-set is given by the <u>sum of all values in the data-set, divided by the number of values</u>.
- The standard deviation of a data-set is given by the square root of the <u>sum of the differences squared between each observation and the mean, divided by the number of values</u>.
For this data-set, the mean is:
M = (1 + 4 + 4 + 4 + 4 + 6 + 5)/7 = 4.
Hence the standard deviation is:

More can be learned about the standard deviation of a data-set at brainly.com/question/12180602
#SPJ1
Answer:
8
Step-by-step explanation:
if we do 128+7.95 we get 135.95. but when we do 128+8(wich is 6.25% of 128) we get 136. so she will pay 8 dollars in shipping
Hope this helps.
Answer:
3x+4 = 5
3x = 5-4
3x = 1
x = 1/3
Since the value of x is found, next step is to substitute it to the x for 6x+7
Value of 6x+7:
6(1/3)+7
6/3+7
2+7
9
100-1.49=98.51
1.25x=98.51
X= 78.808
Barbara needs to sell 79 drinks to make 100 dollars