Question

What is the total area under the standard normal curve to left of z = -2.55 or to the right of z= 1.55 is?

The subject is Elementary Statistics

Answer 1

We know that the z-table gives us the area P(Z X)

1.area under the standard normal curve to left of z = -2.55

P(Z-2.55)=0.0054 (using Z-table)

As shown in the graph above.

2. area under the standard normal curve to the right of z= 1.55

P(Z1.55)=1-P(Z<1.55)=1-0.9394=0.0606 (using Z-table)

As shown above.

finally total area=0.0054+0.0606=0.066

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