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For a normal population with µ = 100 and σ = 20:

1. What is the probability of a particular score being greater than 110?

2. What is the probability of a particular score being less than 50?

  • stats -

    Use z-scores:

    z = (x - mean)/sd

    Your data:
    x = 110, 50
    mean = 100
    sd = 20

    Calculate both z-scores. Use a z-table to determine probability for each score.

    I hope this will help get you started.

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