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OpenStudy (anonymous):
*MEDAL* For a standard normal distribution, which of the following expressions must always be equal to 1? P(z≤-a)-P(-a≤z≤a)+P(z≥a) P(z≤-a)-P(-a≤z≤a)+P(z≥a) P(z≤-a)+P(-a≤z≤a)-P(z≥a) P(z≤-a)+P(-a≤z≤a)+P(Z≥a)
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OpenStudy (amistre64):
the sum of all the probabilites underneath the curve
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