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if the probability of a newborn child being female is 0.5, find the probability that in 100 births, 55 or more will be female.use the normal distribution to approximate the binomial distribution

  • stat -

    Mean = np = 100 * 0.5 = ?
    Standard deviation = √npq = √(100 * 0.5 * 0.5) = ?
    Note: q = 1 - p

    Finish the calculations, then use z-scores.

    z = (x - mean)/sd

    Note: x = 55

    Determine the probability using the z-score and a z-table.

    I hope this will help get you started.

  • stat -

    .1841

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