Z = (X-u)/o = (120-100)/16 = 20/16 = 1.25 area (col C) = .1056

Therefore, 10.56 % of people have an IQ above 120.

1a) . You work as a statistician for a large national car manufacturer. You have just finished analyzing the data for how long it took 235 assemble line teams to install a transmission. The average number of minutes required to install a transmission was 12 minutes (st dev = 0.4). How many teams took more than 12.6 minutes to install a transmission?

1b) Using the data from question 1a) what proportion of teams took more than 11.7 minutes?

1c). You check the statistics for the National Hockey League (NHL) and write down the average (mean) number of minutes each player spends on the ice as well as the standard deviation. You note that your favourite player's time on the ice was 24 minutes and calculate this is 1.2 standard deviations above the mean. A friend asks you what the mean was but you cannot remember, but you do recall that the standard deviation was 3.7. What is the mean number of minutes played by hockey players in the NHL?

1d. If the grades on a test has an average of 68 (SD = 12.5) how many standard deviations above the mean would you have to be if you wanted to be in the top 20% of your class?

What actual mark would need to be in the top 20% of the class?