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The mean amount of time that the 20 employees of a construction company have worked for the company is 6.7 years. After one of the employees leaves the company, the mean amount of time that the remaining employees have worked for the company is reduced to 6.25 years. How many years did the employee who left the company work for the company?
Difficulty: Hard
A:
0.45
B:
2.30
C:
9.00
D:
15.25
| Food | Protein | Cost |
|---|---|---|
| 1 large egg | 6 grams | $0.36 |
| 1 cup of milk | 8 grams | $0.24 |
The table above shows the amount of protein in two foods and the cost of each food. Based on the table, what is the ratio of the cost per gram of protein in a large egg to the cost per gram of protein in a cup of milk?
Difficulty: Medium
A:
1 : 2
B:
2 : 3
C:
3 : 4
D:
2 : 1
A psychologist designed and conducted a study to determine whether playing a certain educational game increases middle school students' accuracy in adding fractions. For the study, the psychologist chose a random sample of 35 students from all of the students at one of the middle schools in a large city. The psychologist found that students who played the game showed significant improvement in accuracy when adding fractions. What is the largest group to which the results of the study can be generalized?
Difficulty: Hard
A:
The 35 students in the sample
B:
All students at the school
C:
All middle school students in the city
D:
All students in the city
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