What are the average and variance of a set of data 1.2.3.4.5?
Average 3
Variance 2
RELATED INFORMATIONS
- 1. It takes 15 hours for a car to go from place a to place B, and 12 hours to return. The speed of return is increased by () a.1/4 b.1/5 C.1 / 6
- 2. Find the square of all numbers 11-24
- 3. A and B two cars from East and west at the same time, the distance ratio is 5:3 when they meet. At this time, B car is 80 kilometers away from the center of the two places How many kilometers are there between the East and the west?
- 4. As shown in the figure, in the quadrilateral ABCD, ab = BC, BF is the bisector of ∠ ABC, AF ‖ DC connects AC and CF
- 5. Some coal has been transported by Party A alone for six times and Party B alone for five times. Now Party A has transported three times and Party B has transported two times, with a total of 18 tons. How many tons in total?
- 6. There are two cargo ships. The cargo carrying capacity of ship a is 25% more than that of ship B. ship a and ship B carry 1800 tons of cargo in total. What are the cargo carrying capacity of ship a and ship B? (use the equation to solve the problem.)
- 7. The speed ratio of the two vehicles is 3:4. After 5 / 4 hours, the two vehicles meet. The distance ratio of the two vehicles is (): ()
- 8. The price of 20 kg apple and 30 kg pear is 132 yuan. The price of 4 kg apple is equal to that of 5 kg pear Please write down the process Just one unknown X Please use the method of the first volume of the fifth grade
- 9. There are two piles of mud. Originally, the mass of cement in pile a is 5 / 7 of that in pile B. now, 12 tons of cement are transported from pile B to pile A. at this time, the mass of cement in pile a is 7.8% How many tons of cement are there in a and B piles
- 10. Real numbers a, B, C, D, satisfy, d > C, a + B = C + D, a + D
- 11. The two trains a and B leave each other from the two cities at the same time. When car a travels 36 kilometers less than car B, the two trains are 264 kilometers apart. Given that the speed ratio of car a and B is 5:6, how many kilometers are the two cities apart
- 12. Points a and B represent real numbers a and B respectively on the number axis. The distance between two points of a and B is expressed as ∣ ab ∣. Then | ab | = | b-a| (1) If two points a and B on the number axis represent real numbers x and - √ 2 respectively, and ab = 3, find the value of X (2) If the three points P, a and B on the number axis represent real numbers x, - 2 and √ 3 respectively, the value range of X is obtained when the algebraic formula | x + √ 2 | + | X - √ 3 | takes the minimum value
- 13. A and B two cars from AB two places to each other, 60 kilometers away from a first meet, each arrived at the other party's starting point, immediately return on the way and 40 kilometers away from a meet How many kilometers are ab apart
- 14. What is a six digit number with three fives and three zeros?
- 15. Given a (- 1, - 1), B (1,3), C (2,5), prove A.B.C three points collinear Fainting, forgetting that the line segment is obtained by subtracting
- 16. x. Y and Z are all positive numbers, and XYZ = 1. Prove that: (1 + X + y) (1 + y + Z) (1 + Z + Z) ≥ 27 Sorry, the letter is wrong, please verify: (1 + X + y) (1 + y + Z) (1 + Z + x) ≥ 27.
- 17. If a, B, C, x, y, Z, > 0, X * 2 + y * 2 + Z * 2 = 1, find the minimum value of F (x, y, z) = A / x + B / y + C / Z
- 18. Given x + 2Y + 3Z = 12, find the minimum value of x ^ 2 + 2Y ^ 2 + 3Z ^ 2
- 19. Given x + 2Y + 3x = 12, find the minimum value of x ^ 2 + 2Y ^ 2 + 3Z ^ 2
- 20. Given that x, y, Z are positive numbers and X + 2Y + 3Z = 2, then s = 1 / x + 2 / y + 3 / Z is the minimum