1. Assuming that the daily wages for workers in a particular industry averages Birr 11.90 per day and the standard deviation is Birr 0.40. If the wages are assumed to be normally distributed, determine what percentage of workers receive wages
A. between Birr 10.90 and Birr 11.90
B. between Birr 10.80 and Birr 12.40
C. between Birr 12.20 and Birr 13.10
D. less than Birr 11.00
E. more than Birr 12.95
2. Is crime rate somehow associated with age? An investigator collected the following data from five sample groups to see the relationship between the two variables:
Average age in year (X) 70 56 35 28 14
Average crime rate (%) (Y) 28 42 35 42 48
A. Determine theregression line of crime rate on age and interpret it?
B. Estimate the % of crime rate for groups of individuals having average age 40.
C. Determine the coefficient of correlation and interpret it.
3. Out of 5 male workers and 7 female workers of a factory, a task force consisting of 5 workers is to be formed. What is the probability that the task force will consist of?
A. 2 male and 3 female workers?
B. all female workers?
C. at least 3 male workers.
4. The probability that an item picked at random from the assembly line in a factory will be defective is 0.02. If a sample of 4 is to be selected, then find the probability that
A. One will be defective
B. At most one will be defective
C. At least one will be defective.
D. Calculate the mean and standard deviation for the distribution
Answers
Answer:
d
Explanation:
Assuming that the daily wages for workers in a particular industry averages Birr 11.90 per day and the standard deviation is Birr 0.40. If the wages are assumed to be normally distributed, determine what percentage of workers receive wages
A. between Birr 10.90 and Birr 11.90
B. between Birr 10.80 and Birr 12.40
C. between Birr 12.20 and Birr 13.10
D. less than Birr 11.00
E. more than Birr 12.95
2. Is crime rate somehow associated with age? An investigator collected the following data from five sample groups to see the relationship between the two variables:
Average age in year (X) 70 56 35 28 14
Average crime rate (%) (Y) 28 42 35 42 48
A. Determine theregression line of crime rate on age and interpret it?
B. Estimate the % of crime rate for groups of individuals having average age 40.
C. Determine the coefficient of correlation and interpret it.
3. Out of 5 male workers and 7 female workers of a factory, a task force consisting of 5 workers is to be formed. What is the probability that the task force will consist of?
A. 2 male and 3 female workers?
B. all female workers?
C. at least 3 male workers.
4. The probability that an item picked at random from the assembly line in a factory will be defective is 0.02. If a sample of 4 is to be selected, then find the probability that
A. One will be defective
B. At most one will be defective
C. At least one will be defective.
D. Calculate the mean and standard deviation for the distribution
what persentage of workers