Question

In a certain college town, 75% of freshmen admit to underage drinking.  If 1000 freshmen are randomly

     chosen, what is the mean and variance of the number that admit to underage drinking?

     a.   750 and 187.5

     b.   750 and 150

     c.   750 and 75

     d.   None of these

Which of the following is most likely to conform to a Poisson distribution?

      a.   The number of days it rains in Big Rapids for each of the last 5 years.

      b.   The amount of time it takes students to walk from the Starr building to the Business building.

      c.   The lengths of 100 grass snakes caught on five successive days.

      d.   The number of five dollar bills in the wallets of 100 shoppers at the mall.

For normal distributions, an increase in the variance would __________.

      a.   widen the bell-curve and lower the height.

      b.   narrow the bell-curve and lower the height.

      c.   widen the bell-curve and raise the height.

      d.   narrow the bell-curve and raise the height.

Answer 1