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Jlenok [28]
3 years ago
12

In a study of the effects of acid rain, a random sample of 100 trees from a particular forest is examined. Forty percent of thes

e show some signs of damage. Which of the following statements is correct?a. None of the aboveb. The sampling distribution of the proportion of damaged trees is approximately Normalc.This is a comparative experiment.d. If a sample of 1000 trees was examined, the variability of the sample proportion would be larger than in a sample of 100 treese. If we took another random sample of trees, we would find that 40% of these would show some signs of damage
Mathematics
1 answer:
kherson [118]3 years ago
3 0

Answer: b. The sampling distribution of the proportion of damaged trees is approximately Normal

Step-by-step explanation:

The sample mean is an unbiased estimator of the true (unknown) population mean and The sampling distribution shows how the sample mean will vary among repeated samples. In the case above the samples are selected at random from a normally distributed population, and the number of samples selected (n=100) is a bit large therefore the sampling distribution will be approximately normal.

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avanturin [10]

Answer:

ʍouʞ ʇ,uop ᴉ ʇnq ʎɹɹos ɯ,ᴉ

7 0
3 years ago
There are four nickels, three dimes, and three quarters in your pocket. You randomly pick three coins and place them on a counte
kupik [55]

Total coins = 10 ( 4 + 3 + 3 = 10).

The probability of picking a nickel first = 4/10 = 2/5 ( 4 nickels out of 10 total).

The probability of picking a dime second = 3/9 = 1/3 ( 3 dimes out of 9 coins left).

The probability of picking the third coin as a quarter = 3/8 ( 3 quarters out of 8 coins left).

The probability of picking all three in that order = 2/5 x 1/3 x 3/8 = 1/20

3 0
3 years ago
It took Miguel 7 mins 38 secs to run one mile. It took Jorja 9mins 13 secs to run one mile. How many more seconds did it take to
ExtremeBDS [4]
38-13=25 more secs. bc ur just dealing with the sec. not min so... just subtract
7 0
3 years ago
Read 2 more answers
Convert the following decimals into rational numbers:<br>1.4325​
matrenka [14]

Answer

\frac{573}{400}

step-by-step explanation:

\frac{1.4325}{1} ×  \frac{10000}{10000}  =  \frac{14325}{10000}

Simplify

\frac{14325}{10000} ÷\frac{25}{25} = \frac{573}{400}

5 0
3 years ago
Can u help solve this ​
8_murik_8 [283]

Answer and Step-by-step explanation:

The expression is equal to 90.

This is because the lines that cut the right angle are cutting it in half, so those base angles are 45, leaving the center angle to be 90 (90 + 45 + 45 = 180).

90 = 19x + 4.5

85.5 = 19x

x = 4.5

<u>The value of x that makes the parallelogram a square is 4.5.</u>

<u></u>

<u></u>

<em><u>I hope this helps!</u></em>

<em><u>#teamtrees #PAW (Plant And Water)</u></em>

6 0
3 years ago
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