Answer:
Yes. Sample size need to be at least 30.
Step-by-step explanation:
The central limit theorem states that the sampling distribution of a sample mean is approximately normal if the sample size is large enough(≥30), even if the population distribution is not normal.
The central limit theorem also states that the sampling distribution will have the following properties
1. The mean of the sampling distribution will be equal to the mean of population distribution.
2. The standard deviation of the sampling distribution will be equal to the variance of the population distribution divided by the sample size.
Answer: #20, x = 3
#21, x = 1/2
Step-by-step explanation:
#20) x + 4 + x + 2+ x + 5 = x + 3 +x+3+x+1+x+1
3x + 11 = 4x + 8
<u>-3x -3x</u>
11= x + 8
<u> - 8 - 8</u>
3 = x
#21) 12x(5) = 6x + 9 + x + 10 + x + 7
60x =8x + 26
<u> -8x -8x</u>
52x = 26
divide both sides by 52
x = 1/2
The GCF here would be 2w, so divide each one by that. Now just divide by that, and multiply the quantity (amount in the parenthesis) by 2w so we don't have a different equation than the original. Now you have your answer: 2w(4w-3w^2)
A unit rate is a comparison where the second value is 1. This could be miles driven per hour (one hour), the cost of one apple, the words you can type in a minute. Unit rates are helpful when trying to compare two quantities.