A bulb after certain testing had a life of 25 months. The standard deviation based on this sample of size one is

Step-by-step explanation:

Using the formula for calculating the standard error of the mean to get the standard deviation. The standard error of the mean is expressed as;

SE = S/√n where;

S is the standard deviation

n is the sample size

Given SE = 25 months and n = 1, on substituting this parameters into the formula, we will have;

25 = S/√1

25 = S/1

cross multiply

S = 25*1

S = 25 months

Hence the standard deviation based on the sample is 25 months

answer: i believe c. is the answer sorry if i am wrong

step-by-step explanation:

d. you cannot tell because there are no values shown.