28/03/2020 Statistics(Senior Class Maths Study by Topics) 28/03/2020 0Comments by Gate Academy Welcome to your Statistics(Senior Class Maths Study by Topics) NAME EMAIL PHONE NUMBER 1. Find the variance and the standard deviation, respectively of the data below5, -3, 6, -2, 4, -8, 4, 7, -10, 10 40.2, 6.34 10.4, 4.34 20.1, 5.34 60, 7.34 2. If a 24 hour day is represented on a pie chart, what is the angle of the sector corresponding to the period between 3 pm on a Monday and 6 am on the following Tuesday? 240 degrees 270 degrees 225 degrees 180 degrees 3. The prices of computers in a catalogue are: N125,000, N99,000, N125,000, N120,000, N110,000, N115,000, N130,000, N120,000, N100,000.Calculate the range N4,000 N31,000 N6,000 N23,000 4. The numbers 2, 5, 7, 8, 10, 15 and 13 are represented on a pie chart . The sum of the angles representing all numbers equal to or greater than 8 is 276 degrees 48 degrees 84 degrees 228 degrees 5. The scores of students in a class test are given in the table below:Marks 1 2 3 4 5 6 7 8 9 10Frequency 0 3 1 2 3 4 2 1 1 0The median score is 3 4.5 5 5.5 6. The scores of a group of students are4, 5, 6, 7, 8.The standard deviation is 3 2 1.7 1.4 7. If x is positive, and the standard deviation of x-1, x+1, 3, 2x-1 and x+3 is 2√2, find the value of x and hence calculate the mean deviation x =4, M.D= 2.4 x =6 , M.D = 2.4 x=6, M.D = 4.2 x= 4.3, M.D = 3 8. The prices of computers in a catalogue are: N125,000, N99,000, N125,000, N120,000, N110,000, N115,000, N130,000, N120,000, N100,000.Calculate the standard deviation N453,083 N10,392.30 N45,830 N5,083 9. In a certain country last year a total of 500 million tons of trash was recycled. The chart below shows the distribution, in millions of tons, for the different types of trashes. How many tons of Iron/Steel was recycled? 19 12 130 120 10. The weights to the nearest kg of a group of students are recorded in the following tableCalculate the mean weight 52.6 32.7 23.4 43 11. No. of goals 0 1 2 3 4 5Frequency 5 6 12 10 2 1If cF(x) is the number of goals less than or equal to x, then cF(1) and cF(3) are, respectively 11, 33 5, 23 6, 10 11, 23 12. The following marks were obtained by candidates in an examination What is the modal group 41-50 71-80 61-70 51-60 13. Find the range of the following datax+2, x-5, x+6, x-2, x-7, x+3, x-10, x-1 12 x+4 16 x-2 14. For the set of numbers4, 6, 2, 10, 8, the difference between the range and the variance is 2 -1 0 1 15. The prices of computers in a catalogue are: N125,000, N99,000, N125,000, N120,000, N110,000, N115,000, N130,000, N120,000, N100,000.Calculate the mean N116,000 N214,000 N40,000 N56,000 16. Find the variance and the standard deviation, respectively of the data below16, 18, 12, 14, 20, 25, 13, 15, 11 1, 13 11. 12.3 17.3, 4.16 3.17, 14 17. The table below shows the frequency distribution of a number of pets in 25 houses Find the median of the distribution 4 5 3 7 18. The scores of students in a class test are given in the table below:Marks 1 2 3 4 5 6 7 8 9 10Frequency 0 3 1 2 3 4 2 1 1 0The number of students who scored at least 5 is 11 10 3 9 19. The diagram illustrates the distribution of marks in a class testThe total number of students who sat for the test is 35 36 48 40 20. The weights to the nearest kg of a group of students are recorded in the following tableCalculate the difference between the mean deviation and the standard deviation 1.6 kg 1.5 kg 1.2 kg 1.3 kg 21. Class 1-3 4-6 7-9Frequency 5 8 5The standard deviation of the frequency distribution in the table above is 2.2 5 2.5 1 22. The table below shows the marks obtained by 8 students taking English and PhysicsThe Standard deviation of English is 13.7 12.7 14.7 15 23. he frequency table of the monthly salaries of 20 people is shown below. salary(in $) frequency 3500 5 4000 8 4200 5 4300 2 Calculate the standard deviation of the salaries of the 20 people. 282 350 143 254 24. The following marks were obtained by candidates in an examination Calculate the 42nd percentile 51.5 81.5 61.5 71.3 25. The scores of students in a class test are given in the table below:Marks 1 2 3 4 5 6 7 8 9 10Frequency 0 3 1 2 3 4 2 1 1 0The mean score is 5.0 4.9 4.8 5.1 1 out of 25 Time is Up! Time's up