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4=-2(×+3)
please put the solution
thank ​

Answers

  • Réponse publiée par: jemuelpogi

    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 !

  • Réponse publiée par: kuanjunjunkuan
    Confidence interval for the population mean
    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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4=-2(×+3)please put the solutionthank ​...