Answer:

And replacing we got:

Step-by-step explanation:
We can define the random variable X as the thickness of a protective coating applied to a conductor designed to work in corrosive conditions. And the distribution for X is given by:

And we want to find this probability:

And in order to find this probability we can use the cumulative distribution function given by:

And if we use this formula for the probability desired we have:

And replacing we got:

Answer:
189sq.cm
Step-by-step explanation:
Area of a parallelogram = b×h
= 21× 9
= 189 cm^2
The answer is 11/9 hope that helps