A normal curve table tells you that the probability lying below z = -1 is .1587. This can be interpreted as:

15.87% of the area under the curve lies below z = -1.

15.87% of the area under the curve lies at or below z = -1.

A random selection from the population has a 15.87% chance of being below z = -1.

A random selection from the population has a 15.87% chance of being at or below z = -1.

All of the above

Question

A normal curve table tells you that the probability lying below z = -1 is .1587. This can be interpreted as:

       15.87% of the area under the curve lies below z = -1.

       15.87% of the area under the curve lies at or below z = -1.

       A random selection from the population has a 15.87% chance of being below z = -1.

       A random selection from the population has a 15.87% chance of being at or below z = -1.

       All of the above

jim_thompson5910 · Answer

Any ideas on this?

anonymous · Answer

D.

jim_thompson5910 · Answer

why that one?

anonymous · Answer

because the question is talking about probability and so the word chance correlates with that concept and at or below z=-1 makes more sense

jim_thompson5910 · Answer

it also turns out that the area under the curve to the left of z = -1 also represents this probability

it's like throwing a dart and it has a 15.87% chance of hitting the area

jim_thompson5910 · Answer

so all 4 are saying the same thing in slightly different ways

jim_thompson5910 · Answer

meaning that the answer is really "all of the above"

anonymous · Answer

oh ok lol ty for helping me see that ty

jim_thompson5910 · Answer

you're welcome