Someone please help me with this
1 answer:
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Answer:
42 adults and 196 children went to the zoo
Step-by-step explanation:
Let
x ----> the number of adults
y ----> the number of children
we know that
The total bill for the 238 people from a school trip was $1330
so
----> equation A
----> equation B
Solve the system of equations by graphing
Remember that the solution is the intersection point both graphs
using a graphing tool
the solution is the point (42,196)
see the attached figure
therefore
42 adults and 196 children went to the zoo
The confidence interval is 0.028, 0.872
<h3>Given </h3>862 of 1013 randomly selected adults wear seat belts.
The 95% confidence interval for the proportion of adults who always wear seat belts.
<h3>What is confidence interval?</h3>A Confidence Interval is defined as a range of values we are sure our true value lies within it.
<h3>What is 95% confidence interval?</h3>A 95% confidence interval is defined as that if we take 100 different samples and compute a 95% confidence interval for each sample, then approximately 95 of the 100 confidence intervals will contain the true mean value.
= 862/1013 = 0.85
At a 95% confidence interval ,the critical value is
The 95% confidence interval for proportion is
= 0.028, 0.872
The sample should use at least 10 successes and 10 failures.
As the sample size is larger, we can use an approximate formula for the standard error.
Learn more on Confidence intervals here:
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