1) Negative value of Z will give negative probability value.

a) Yes

b) No

c) sometimes

d) always

2) Area on a normal distribution can be visualized in how many ways?

a) 2

b) 4

c) 3

d) 1

3) A radar unit is used to measure speeds of cars on a motorway. The speeds are normally distributed with a mean of 90 km/hr and a standard deviation of 10 km/hr. What is the probability that a car picked at random is travelling at more than 100 km/hr?

a) 8.20%

b)18.20%

c)48.20%

d) 15.87%

4) The mean of a random variable whose PDF is f(x)=2(1-x) when 0 is less than x and x is less than 1 and the PDF is 0 otherwise is equal to?

a) 0.3333

b) 0.2222

c) 0.123

d) 0.243