Reference no: EM132289120

1.The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 51 and a standard deviation of 8. Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 51 and 67

Do not enter the percent symbol.

ans =  %

2. Use the Empirical Rule to answer the questions below:

The distribution of weights for newborn babies is approximately normally distributed with a mean of 7.4 pounds and a standard deviation of 0.6 pounds.

1. What percent of newborn babies weigh more than 8 pounds? %

2. The middle 95% of newborn babies weigh between  and  pounds.

3. What percent of newborn babies weigh less than 6.2 pounds? %

4. Approximately 50% of newborn babies weigh more than  pounds.

5. What percent of newborn babies weigh between 6.8 and 9.2 pounds? %

3.A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 46 months and a standard deviation of 4 months. Using the 68-95-99.7 rule, what is the approximate percentage of cars that remain in service between 34 and 42 months?

Do not enter the percent symbol.

ans =  %