# 4=-2(×+3)

please put the solution

thank

Answers: 1

## Answers

4=-2(×+3)please put the solutionthank ...

please put the solution

thank

Answers: 1

4=-2(×+3)please put the solutionthank ...

Hello !!

We need find the solution for

4 = -2(x+3).

4 = -2(x + 3)

4 = -2x - 6

2x = -6 - 4

2x = -10

x = -10/2

x = -5

Final result : the solution for (x) is -5.

I hope I have collaborated !

z-test or normal distribution

solution:

given:

n=20, x̄ =89, s=2.0, 99%

formula:

x̄ -z_alpha/2(s/square root of n)< µ< x̄ +z_alpha/2(s/square root of n)

89-(2.575)(2.0/square root of 20)< µ< 89-(2.575)(2.0/square root of 20)

87.848< µ< 90.152

margin of error:

solution:

the critical value is 2.575.

the standard deviation is 2.0 (from the question), but as this is a sample, we need the standard error for the mean.

the formula for the se of the mean is standard deviation / √(sample size), so: 2.0/ √(20)=0.447.

me=2.575 * 0.447 = 1.151.

therefore, the margin of error is 1.151 with the confidence interval of 87.848< µ< 90.152.

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