Answer:
k=9
Step-by-step explanation:
P(4)= 1/8
This is because there are 8 equal parts and 4 is just one of those 8 parts.
1) Mean
The mean is given by the sum of the data divided by the number of data (4, in this case):
2) Standard deviation
The standard deviation is given by:
where
is the mean, that we already found at point 1), and N=4. Substituting data, we have: