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    Normal Probability Distribution and Confidence Intervals

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    What is the probability of P(-1.4 < Z < 0.6)?

    In a standard normal distribution, what is the area which lies between Z = -1.72 and
    Z = 2.53?

    Use the following information to conduct the confidence intervals specified to estimate μ.
    95% confidence; X ̅=25, σ^2= 12.25, and n=60.

    30% confidence; X ̅=119.6, S^2= 570.7321, and n=75

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    https://brainmass.com/statistics/probability/normal-probability-distribution-confidence-intervals-592736

    Solution Preview

    Hi there,

    P(-1.4<z<0.6)=P(z<0.6)-P(z<-1.4)=0.7257-0.0808=0.6449
    area which lies between z=-1.72 and z=2.53: ...

    $2.19