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31.03.2020 •
Mathematics
Three randomly selected households are surveyed. The numbers of people in the households are 2, 4, and 9. Assume that samples of size n-2 are randomly selected
with replacement from the population of 2, 4, and 9. Construct a probability distribution table that describes the sampling distribution of the proportion of avon numbers
when samples of sizes n=2 are randomly selected. Does the mean of the sample proportions equal the proportion of even numbers in the population? Do the sample
proportions target the value of the population proportion? Does the sample proportion make a good estimator of the population proportion? Listed below are the ning
possible samples
2,2 2,4 2,9 4,2 4,4 4,9 9,2 9,4 9,9
Construct the probability distribution table
Sample
Probability
Proportion
(Type an integer or fraction)
Solved
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Ответ:
Answer
5 and -4
Explanation
If the two triangle are congruent then they have the same area.
20 = x² - x
x² - x - 20 = 0
x² - x + (1/2)² = 20 + (1/2)²
(x - 1/2)² = 20.25
x - 1/2 = √20.25
x - 1/2 = 4.5 or x - 1/2 = - 4.5
x = 4 1/2 + 1/2 x = -4 1/2 + 1/2
= 5 = -4
The values of x are 5 and -4.