2/5 Is the answer! Am pretty sure Hope this helped
Answer: 385
Given: error: 6 months, standard deviation = 5 years is 60 months
Step 1: find the minimal sample size ‘n’ for 95% confidence interval
1-0.95= 0.05
0.05/2= 0.025
Step 2:
1-0.025= 0.975
View attachment for more steps
An exterior angle is equal to the sum of the two opposite inside angles.
45x = 25x + 57 +x
Simplify the right side:
45x = 26x +57
Subtract 26x from each side:
19x = 57
Divide each side by 19"
x = 57 / 19
x = 3