Erica measures the mass of a steel ball several different times. If Erica's results are highly precise, this must mean that

most of her results are close to the actual measurement.

most of her results are very far from the actual measurement.

her results are all very different from one another.

her results are all very close to one another.

Question

Erica measures the mass of a steel ball several different times. If Erica's results are highly precise, this must mean that

    most of her results are close to the actual measurement.

    most of her results are very far from the actual measurement.

    her results are all very different from one another.

    her results are all very close to one another.

anonymous · Answer

Oohh this.

anonymous · Answer

D. Her results are all very close to one another.

anonymous · Answer

lol ya

anonymous · Answer

ok how do u predict tht it is D

anonymous · Answer

You remember what precision means, right? :D

anonymous · Answer

I'm writing an explanation, one sec :)

anonymous · Answer

ya never mind i get it

anonymous · Answer

Okay, so A and B are completely out of the question because you wouldn't know what the answer of what the measurement was until you tested it.  Your tests would predict the measurement.  C isn't right because different measurements wouldn't make it precise.  It's precise because all of her measurements turned out similar, therefore making the average precise.

anonymous · Answer

Oops, just saw you got it.  Sorry :p.