Answer:
A: C = 15N
Step-by-step explanation:
30/2 = 15 (the cost of 1 class)
Answer:
3-7x
Step-by-step explanation:
Liza is wrong because...
Friday = 237
Saturday = 237 + 446
Both days = 920
Answer:
At least 547 records need to be studied.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of
, and a confidence interval
, we have the following confidence interval of proportions.

In which
Z is the zscore that has a pvalue of
.
And the margin of error is:

95% confidence interval
So
, z is the value of Z that has a pvalue of
, so
.
In this problem, we have that:






At least 547 records need to be studied.
<span>9.99p + 6.67p ≤ 30
9.99p + 6.67p less than or equall to 30</span>