Question

The standard normal curve shown below is a probability density curve for a

Answer 1

Answer:

  E. 0.6872

Step-by-step explanation:

An appropriate calculator or Z-table is needed for answering questions like this. My calculator tells me the area is ...

  0.687267787 ≈ 0.6873

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The web app shown in the attachment gives the same 4-digit value.

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If you look up the area values in a table, you might find ...

  p(z < -1.2) = 0.1151

  p(z < 0.85) = 0.8023

Then the difference is ...

  p(-1.2 < z < 0.85) = 0.8023 -0.1151 = 0.6872

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Note that the least significant digit of the difference between rounded numbers often cannot be trusted to be accurate--as in this case.