The average (arithmetic mean) of five number is 26. After one of the numbers is removed, the average (arithmetic mean) of the remaining numbers is 25. What number has been removed
A: 20
B: 25
C: 26
D: 30
E: (E) 32
A: 20
B: 25
C: 26
D: 30
E: (E) 32
举一反三
- The average (arithmetic mean) of five number is 26. After one of the numbers is removed, the average (arithmetic mean) of the remaining numbers is 25. What number has been removed A: 20 B: 25 C: 26 D: 30 E: (E) 32
- Each of the following numbers has two digits blotted out． Which of the numbers could be the number of hours in x days，where x is an integer（） A: 25■，■06 B: 50■，■26 C: 56■，■02 D: 62■，■50 E: 65■，■20
- The arithmetic average of a set of data is known as its . A: mean B: median C: precision D: experimental result
- The influence of weights on the weighted arithmetic mean is determined by () A: Value size of each group of character values B: What is the absolute number of weights C: Proportion of the number of units in each group to the population number of units D: What is the population number of units
- The influence of weight on weighted arithmetic mean depends on ( ) A: Value size of each group of character values B: What is the absolute number of weights C: Proportion of units in each group to total units D: What is the population number of units