Answer:
The step 3 is incorrect in the conversion, is not necessary
Step-by-step explanation:
we have
The speed is 
we know that
1 mm=0.1 cm
1 min=1/60 h
so

step 1
Multiply 76 by 0.1

The step 1 is correct
step 2
Multiply the result obtained in step 1 by 60.

The step 2 is correct
step 3
Multiply the result obtained in step 2 by 60
<u><em>This step is not correct</em></u>
therefore
The step 3 is incorrect in the conversion, is not necessary
Answer:
a. 0.5
Step-by-step explanation:
We know that X follows normal distribution with
mean=75
standard deviation=8


P(0<Z<∞)
The area under the normal curve is 1 and the (0<Z<∞) =0.5 and (-∞<Z<0) =0.5
So, P(0<Z<∞)=0.5
Hence the P(X ≥ 75)=0.5