Brandon made $38.00 in 3 hours. How much would he make in 10 hours
2 answers:
Answer:
would make $126.67 in 10 hours
Step-by-step explanation:
To find how much Brandon will make in 10 hours, we will follow the steps below:
using proportion,
Let x be the amount he would make in 10 hours
$38 = 3 hours
x = 10 hours
cross-multiply
3×x =$38×10
3x = 380
Divide both-side of the equation by 3
=
At the left-hand side of the equation 3 will cancel-out 3 leaving us with just x while at the right-hand side of the equation 380 will be divided by 3, hence;
x ≈$ 126.67
He would make $126.67 in 10 hours
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Answer:
The 99% confidence interval estimate of the percentage of girls born is (74.37%, 85.63%).
Usually, 50% of the babies are girls. This confidence interval gives values considerably higher than that, so the method to increase the probability of conceiving a girl appears to be very effective.
Step-by-step explanation:
Confidence Interval for the proportion:
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:
99% 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:
For the percentage:
Multiplying the proportions by 100.
The 99% confidence interval estimate of the percentage of girls born is (74.37%, 85.63%).
Usually, 50% of the babies are girls. This confidence interval gives values considerably higher than that, so the method to increase the probability of conceiving a girl appears to be very effective.