Answer:
17 = K
Step-by-step explanation:
Add 5 to both sides to get K = 17
Answer:
If it counts as a question, lol sure, I'd love to help
For margin of error to be a maximum of 3:
3 = z*(SD / sqrt(n)), where z is the z-score, SD is the standard deviation and n is the sample size.
z = 1.96 for a 95% confidence interval, and we are given SD = 15.
3 = 1.96*15/sqrt(n)
sqrt(n) = 9.8
n = 96.04 ~ 96 commercials.
