Tanner took a statistics test whose mean was 80 and standard deviation was 5.The total points possible was 100.Tanner's score was 2 standard deviations below the mean.What was Tanner's score,rounded to the nearest whole number?

A) 78
B) 70
C) 90
D) None of these choices.

Standard Deviation

A gauge for the extent of variability or scatter among a group of numbers, highlighting the deviation of these values from their average.

Mean

The average of a set of numerical values, calculated by summing them together and then dividing by the number of observations.