Here we have to find the probability
. Now express the probability in terms of standard normal cumulative distribution function. That is
.

Now you can look up the probability from the standard normal tables. Its value is

# of points Farid has = b+35.
So the expression would be b+35.
Answer:
its pretty simple actually put a point after the -1 (-0.9) and move left twice from -1 to get the plot point -1.2
To Visualize data changes/trends over time.