Since Sarah’s age is 2x of Bob’s age (which is 42) Sarah is 84.
Answer:D 237x/421x-515
Step-by-step explanation:
ANSWER:
104
STEP-BY-STEP EXPLANATION:
Given:
Standard deviation (σ) = 700
Confidence level = 95%
Mean error (Eμ) = 135
We have for a confidence level of 95%:

Now, we calculate the minimum value of the sample size as follows:

The minimum sample size needed is 104