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## Question 1 of 5

Which of the following statements regarding the probability density function of the normal distribution $N(1,2^2)$ is false:

## Question 2 of 5

Calls come into a telephone exchange at random at a rate of 5 per minute.

What is the probability that exactly 10 calls come during a given 2-minute period?

## Question 3 of 5

Two brothers are evenly matched when playing chess. One day they decide to play until one or the other has won three games in a row.

Ignoring draws(ties), what is the probability that they play exactly three games?

## Question 4 of 5

Two brothers are evenly matched when playing chess. One day they decide to play until one or the other has won three games in a row.

Ignoring draws(ties), what is the probability that they play exactly four games?

## Question 5 of 5

Let X be normally distributed with mean $36$ and variance $9$.

$P(X \geq 30)$ equals approximately: