Which step has the incorrect instruction?

On a architect's drawing of a house, 1 inche representa 1.5

Acircle has a circumference of 7.850 units. what is its radius?

In a certain city, the hourly wage of workers on temporary employment contracts is normally distributed. the mean is $15 and the standard deviation is $3. what percentage of temporary workers earn less than $12 per hour? a. 6% b. 16% c. 26% d. 36%