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Bla 20 20
Answer:
18x+18
Step-by-step explanation:
Answer:
The 90% confidence interval for the percentage of people the company contacts who may buy something is between 10.82% and 14%
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of
, and a confidence level of
, we have the following confidence interval of proportions.

In which
z is the zscore that has a pvalue of
.
For this problem, we have that:

90% confidence level
So
, z is the value of Z that has a pvalue of
, so
.
The lower limit of this interval is:

The upper limit of this interval is:

The 90% confidence interval for the percentage of people the company contacts who may buy something is between 10.82% and 14%
Answer:
Step-by-step explanation:
P=2x+2y+4
y=p/2-x-2
500
20 × 30 = 600
30 ÷ 2 = 15
15 × 5 = 75
600 + 75 = 675
675 - 500 = 175
Davie made 175 in profit.