For a standard normal distribution, which of the following expressions must always be equal to 1?

A) P (z≤-a) - P (-a≤z≤a) + P (z≥a)

B) P (z≤-a) - P (-a≤z≤a) + P (z≥a)

C) P (z≤-a) + P (-a≤z≤a) - P (z≥a)

D) P (z≤-a) + P (-a≤z≤a) + P (Z≥a)

What is the standard form of 210 million 64050

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