1. For the purpose of performance evaluation and quota adjustment, Ralph Williams monitored the auto sales of his 40 salespeople. Over a 1-month period, they sold the following number of cars: 7, 8, 5, 10, 9, 10, 2, 12, 8, 6, 10, 11, 6, 5, 10, 11, 10, 5, 9, 13, 8, 12, 8, 8, 10, 16, 7, 6, 8, 8, 5, 6, 9, 7, 14, 8, 7, 5, 5, 14. Construct a frequency distribution (table) with 5 classes to summarize these data.
2. The Haverford Company manufactures a product that requires three types of labor, unskilled, semi-skilled and skilled. The hourly wages for these laborers are: unskilled = $5.00, semi-skilled = $7.00 and skilled = $9.00. If the product requires the following number of hours to produce, what is the average labor cost per hour?
Labor Type
Hours
Unskilled
1
Semi-skilled
2
Skilled
5
3. The mean weight (μ) of all 500 male students at a certain college is 151 pounds and the standard deviation (σ) is 15 pounds. Assuming the weights are normally distributed, find how many students weigh:
a. a. between 120 and 155 pounds
b. more than 85 pounds