Answer:

The critical value for 95% of confidence is 
And since we know the total and the proportion is defined as:

If we solve for X (number of people who say yes) we got:

And the best answer would be:
294
Step-by-step explanation:
We know that the confidence interval for the proportion is given by:

The margin of error for the proportion interval is given by this formula:
(a)
The margin of error can be calculated with this formula:

And the estimation for the true proportion is:

The critical value for 95% of confidence is 
And since we know the total and the proportion is defined as:

If we solve for X (number of people who say yes) we got:

And the best answer would be:
294