Recall that the mean of a given set of numbers is the sum of the numbers divided by the number of numbers, therefore, the mean of the dataset is:

Now, the range of a data set is the difference between the maximum and the minimum, in this case, the maximum is 99, and the minimum is 15 therefore, the range is:

Finally, the standard deviation is given by the following formula:

where N is the sample size, x_i is an element of the set, and x^- is the mean. The standard deviation of the set is:

<h2>Answer: </h2>
is there more information
Answer:
x=3z+y/2
i hope this answers your question
Answer:A polynomial added to a polynomial also still gives a polymonial
Answer:
Step-by-step explanation:
Here is how to get 9:
3x = 4(x - 2.25)
Solve 4(x - 2.25)
3x = 4x - 9
Move the variable to the left side and change it's sign
3x - 4x = -9
Combine like terms
-x = -9
change the signs
x = 9
There ya go! I hope this isn't too confusing!