There are seven numbers in a row, their average is 32, the first three numbers are 28, the last five numbers are 33, find the third number
Third
28x3+33x5-32x7
=84+165-224
=25
If you ask questions from your mobile phone, just click "satisfied" in the upper right corner of the client
RELATED INFORMATIONS
- 1. There are nine numbers in a row. Their average is 32. The average of the first five numbers is 28. The average of the last five numbers is 33?
- 2. There are seven numbers in a row. The average of them is 30. The average of the first three numbers is 28. The average of the last five numbers is 33
- 3. There are seven numbers in a row. The average of them is 30. The average of the first three numbers is 28. The average of the last five numbers is 33
- 4. There are seven numbers in a row. The average of them is 30. The average of the first three numbers is 28. The average of the last five numbers is 33
- 5. Observe the following two columns: 5, 9, 13, 17, 21, 25, 29, 33 4,7,10,13,16,19,22,25…… Which is the 15th pair of the same number among them
- 6. Observe the following group numbers - 1,1,5,11,19,29 1) Use an algebraic expression containing n to represent the nth number in this column. 2) is 2010 in this column? If yes, find out how many numbers are lower. If not, explain the reason
- 7. 5,11,19,29 the next number according to the law
- 8. From the beginning, add 4 and 5 in turn to get the following column of numbers 1, 5, 10, 14, 19, 23 and 28. The number closest to 2009 in this column is ()
- 9. The formula arranged according to certain rules: 3 + 1,4 + 7,5 + 13,6 + 19 +. Then, what is the 100th formula?
- 10. Write the formula according to the law, 3 1.. 5 7.. 7 13.. 9 19 So what's the 100th formula?
- 11. After Xiao Liang calculated the average of 50 data, he carelessly mixed the average with the original 50 data to form 51 data. He forgot that it was the average. If the average of the 51 data happened to be 51, what was the average of the original 50 data? Solving a series of equations
- 12. In a group of data, 40, 39, 41, 43, 50, 44, 60, 51, 46 is more appropriate to use median or average, why 0
- 13. In a group of data, 40, 39, 41, 43, 50, 44, 60, 51, 46 is more appropriate to use median or average The weight of female students in the first group of six-year class is as follows: 40, 39, 41, 43, 50, 44, 60, 51, 46. Is it more appropriate to use median or average to represent the weight of female students in this group The weight of female students in the first group of six-year class is as follows: 40, 39, 41, 43, 50, 44, 60, 51, 46. Is it more appropriate to use median or average to represent the weight of female students in this group? Why
- 14. There are 7 data from small to large, the average is 38. If the average of the first four numbers is 33, and the average of the last four numbers is 42, try to find the median of this group of data
- 15. There are seven numbers in order from big to small, the average is 38. The average of the first four numbers is 33, and the average of the last four numbers is 42. Find the median of these seven numbers
- 16. There are seven numbers from small to large, the average is 38, if the average of the first four numbers in this group is 33 There are seven numbers from small to large, with an average of 38. If the average of the first four numbers in this group is 33 and the average of the last four numbers is 42, what is the median of these seven numbers?
- 17. If the average of the first four numbers is 33 and the average of the last four numbers is 42, find the median of the group
- 18. 42, 44, 57, 45, 66, 55, 48, 44, 51, 47, 60, 54, 48, 53 the average is 51 s²=?
- 19. In order to connect a small "6V 3W" light bulb to a 24 V power supply and light normally, it is necessary to connect a series of resistors, the rated power of the resistor at least, and the total power of the whole circuit
- 20. Voltage: 220 V, frequency: 50 Hz, vibration frequency: 3200 / R - 2600 / R. I want to calculate the power