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
内容
- 0
Last year, a certain public transportation system sold an average (arithmetic mean) of 41,000 tickets per day on weekdays (Monday through Friday) and an average of 18,000 tickets per day on Saturday and Sunday. Which of the following is closest to the total number of tickets sold last year A: 1 million B: 1.25 million C: 10 million D: 12.5 million E: (E) 125 million
- 1
Which of the following statements about the arithmetic mean is not always correct? A: The mean is a measure of the middle (centre) of a distribution. B: Half of the observations are on either side of the mean. C: The sum of the deviations from the mean is zero. D: The value of the mean times the number of observations equals the sum of all of the observations.
- 2
Read the text and find out what these numbers mean. The first one has been done for you . 200,000: the smallest number of Volvo cars that Geely plans to sell per year. 1945:
- 3
Place in the middle box a number larger than 1. If the number is the correct one, all the other numbers can be divided by it without leaving any remainder. What is the number
- 4
The smaller the spread of scores around the arithmetic mean,