Answer:

Step-by-step explanation:
Given

See attachment
Required
Determine the measure of 
and
are on a straight line.
So:
--- angle on a straight line
Substitute known values

Collect like terms


martemat 20 e7 72gsys y3823 485 u
Those are the ranges for one tandard deviation below the mean and one standard deviation above the mean, and we know that 68% of the data falls in that range, so the probability that a randomly chosen worker makes that much is 68%
Step-by-step explanation:
Given the expression:

Follow BODMAS rule.
always evaluate brackets first, followed by multiply or division then addition or subtraction from LEFT to RIGHT.
