The exponential function is 
Step-by-step explanation:
The exponential function in the form of 
First find the value of a and b if x=0 and y=19

Find the value of b in 
where x=6,y=1216 and a=19
![1216=19b^6\\\\\\1216/19=b^6\\\\\\64=b^6\\\\\sqrt[6]{64} =b\\\\2=b](https://tex.z-dn.net/?f=1216%3D19b%5E6%5C%5C%5C%5C%5C%5C1216%2F19%3Db%5E6%5C%5C%5C%5C%5C%5C64%3Db%5E6%5C%5C%5C%5C%5Csqrt%5B6%5D%7B64%7D%20%3Db%5C%5C%5C%5C2%3Db)
The function is 
Learn More
Exponential function :brainly.com/question/11925273
Keywords : exponential function
#LearnwithBrainly
Answer:
3.39
Step-by-step explanation:
We will use SD formula to find our answer.

= Standard deviation.
= Mean.
N= Numbers of data-points.
We have been given that mean of our data set is 9. So we will find the square of each data point's distance to the mean.
Now let us substitute our given values in above formula.


Upon adding the square of distances we will get,

Upon dividing 46 by 4 we will get,
Upon taking square root of 11.5 we will get,
Therefore, the standard deviation for our given data set will be 3.39.