The data shows 68% percent of the area under the normal
distribution. This is equivalent to:

Plus or minus 1 standard deviation from the mean.

Step-by-step explanation:

According to the Empirical rule,

If the population is normally distributed then, about 68% of the population lies within 1 standard deviation from the mean value.

Here, the data shows 68% percent of the area under the normal  distribution.

This is equivalent to "plus or minus 1 standard deviation from the mean."

Hence, the correct option is : plus or minus 1 standard deviation from the mean.

the amount you'd have after the work is $1.55

step-by-step explanation:

you subtract 95% from $31.