Using the formula for a z-distribution confidence interval of proportions, he also needs to know the confidence level.
<h3>What is a confidence interval of proportions?</h3>
A confidence interval of proportions is given by:
In which:
- is the sample proportion.
Of these 3 itens, the problem states that he knows the sample size and the sample proportion, hence he needs to know z to determine the confidence interval. z depends on the confidence level, which is the remaining parameter.
More can be learned about the z-distribution at brainly.com/question/25890103
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Answer: -21, what ever number you have you subtract 3 from that number. So after -9 would be -12 and so on
2x - y = 2
<u>6x - y = -2</u>
<u>-4x</u> = <u>0</u>
-4 -4
x = 0
2x - y = 2
2(0) - y = 2
0 - y = 2
<u>+ 0 + 0</u>
<u>-y</u> = <u>2</u>
-1 -1
y = -2
(x, y) = (0, -2)
Rewrite 5% as a decimal and then multiply by 60.
X = 0.05 x 60
No solution because if you distribute -4 to both 2.5y and -3.25 your equation becomes -10y+13-15 1/4=-10y. Then you subtract both 13 and 15 1/4 and get -2.25 so your equation becomes -10y-2.25=-10y. After that you add 10y to both side so your equation becomes -2.25=0 which has no solution.