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Ka wai 發問於 科學及數學數學 · 5 年前

Finite Math Question

If Z is the standard normal random variable and Pr[k < Z < -1.34] = .0673,

what is k?

A.-2

B.-1.59

C.0.0673

D..9772

E.2

1 個解答

評分
  • 5 年前
    最愛解答

    Please read:

    Pr(k < Z < -1.34) = 0.0673

    Pr(1.34 < Z < -k) = 0.0673

    Pr(0 < Z < -k) - Pr(0 < Z < 1.34) = 0.0673

    Pr(0 < Z < -k) - 0.4099 = 0.0673

    Pr(0 < Z < -k) = 0.0673 + 0.4099

    Pr(0 < Z < -k) = 0.4772

    -k = 2.00

    k = -2

    The answer is A.

    圖片參考:https://s.yimg.com/rk/HA00430218/o/201770806.gif

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