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Serhud [2]
3 years ago
6

4 is to 3 as x is to 20

Mathematics
2 answers:
natima [27]3 years ago
8 0
X = 26 2/3 or 26.2 (the 2 repeating)
vlada-n [284]3 years ago
4 0
X is going to be 19 if 4 is to 3
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A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 335335 babies were​ born
strojnjashka [21]

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 \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

n = 335, \pi = \frac{268}{335} = 0.8

99% confidence level

So \alpha = 0.01, z is the value of Z that has a pvalue of 1 - \frac{0.01}{2} = 0.995, so Z = 2.575.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 - 2.575\sqrt{\frac{0.8*0.2}{335}} = 0.7437

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 + 2.575\sqrt{\frac{0.8*0.2}{335}} = 0.8563

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.

7 0
3 years ago
WHAT IS THE WHOLE FOR 3 3/4 PLEASE HELP ME
jarptica [38.1K]

Answer:

15/4

Step-by-step explanation:

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A theater has 30 seats in the first row, 33 seats in the second row, 36 seats in the third row, and so on in the same increasing
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The answer is A. 765

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What is 220086*567890
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Answer:

124984638540

Step-by-step explanation:

just use a calculator

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3 years ago
Three equal ratios to 6/7
Rashid [163]
12/14 , 18/21 , 24/28
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