The length and breadth of a rectangles are in the ratio 8:5. If its perimeter is 104cm, find the length of the rectangle
2 answers:
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3x = -7 Divide both sides by 3. 3 goes into seven twice with one-third left over. Since it's a negative seven, the answer will also be negative.
x = -2
x = -2
Answer:
The 95% confidence interval for the proportion of water specimens that contain detectable levels of lead is (0.472,0.766).
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 .
In a sample of 42 water specimens taken from a construction site, 26 contained detectable levels of lead.
This means that
95% 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 95% confidence interval for the proportion of water specimens that contain detectable levels of lead is (0.472,0.766).