Welcome to your Statistics(Senior Class Maths Study by Topics) NAME EMAIL PHONE NUMBER 1. The diagram illustrates the distribution of marks in a class testThe average and the modal marks scored are, respectively 4.7, 5 5, 4 4.7, 4 4, 5 2. The scores of a class of students in a test are shown below:Scores 2 3 4 5 6 7No. of students 1 3 5 x 4 2If the average score is 14/3, the value of x is 5 4 3 6 3. In an experiment, the mean of 25 observations was 6. One of the observations, which has the value of 30, was cancelled. The mean of the remaining observations is 3.5 5 4.5 4.8 4. 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 N56,000 N214,000 N40,000 5. The total income of a household for one year is N60,000. This amount is spent on rent(R), food(F), education for the children(E), general maintenance(G) and miscellaneous items(M).What is the amount spent on food items N10,000 N15,000 N20,000 N30,000 6. The marks scored by students in a test are recorded in the table belowCalculate the standard deviation 1.84 1.34 2.34 2.13 7. 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 N45,830 N10,392.30 N5,083 N453,083 8. The diagram shows the distribution of the number of candidates offering Biology(B), Goegraphy(G), Economics(E), French(F) and History(H) in a school certificate class of 60 students. The number of candidates offering Economics is 16 14 18 20 9. Find the variance and the standard deviation, respectively of the data below16, 18, 12, 14, 20, 25, 13, 15, 11 11. 12.3 17.3, 4.16 3.17, 14 1, 13 10. 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 took the test is 15 25 17 20 11. Find the range of the following data1/4, 5/8, 3/10, 2/5, 7/10, 7/8, 3/4 3/5 3/4 7/10 5/8 12. The table below shows the weight distribution of a group of potatoes.Weight(g) 1-5 6-10 11-15 16-20 21-25No. of potatoes 3 7 5 3 2The mean of the distribution is 10 g 11.5 g 10.5 g 11 g 13. In a class of 20 students the scores in a Mathematics test out of 10 marks are as follows:5, 3, 6, 7, 8, 4, 5, 4, 9, 34, 6, 4, 5, 7, 4, 5, 6, 7, 2The median score is 3 5 4.5 4 14. The distribution of grades in a Mathematics examination taken by a class of 72 students is represented on a pie chart. If the angle of the sector representing the number of students who scored the A grade is 30°, the actual number of A grades scored is 6 9 8 12 15. The marks scored by students in a test are recorded in the table belowCalculate semi interquartile range 3 2 0 1 16. 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 deviation N7,354.34 N4,290.23 N353 N8,888.89 17. The average age of the three children in a family is 9 yr. If the average age of their parents is 39 yr, the average age of the whole family is 27 yr 21 yr 20 yr 24 yr 18. The heights of eight children are: 1 m, 1.2 m, 0.9 m, 0.8 m, 1.4 m, 0.8 m, 1.2 m and 1.1 m. The sum of the mean and the range is 1.65 m 1.11 m 1.85 m 2.45 m 19. The variance and standard deviation of the set of numbers-4, -2, 0, 2, 4 are, respectively 8, 2.8 4, 2 0, 0 64, 8 20. The pie chart below shows the distribution of the expenditure of a household on various food items in a certain month. If N200 was spent on fruits, how much was spent on rice? N1,000 N400 N600 N800 21. The following marks were obtained by candidates in an examination Calculate the third quartile 65.3 82.4 53.8 73 22. The table below shows the frequency distribution of marks scored by students in a class test:Score 1 2 3 4 5Frequency x+2 x-1 2x-3 x+4 3x-4 If the average score is 43/14, how many students scored 3 points? 7 3 1 5 23. Find the variance and the standard deviation, respectively of the data below5, -3, 6, -2, 4, -8, 4, 7, -10, 10 20.1, 5.34 40.2, 6.34 10.4, 4.34 60, 7.34 24. In a class of 20 students the scores in a Mathematics test out of 10 marks are as follows:5, 3, 6, 7, 8, 4, 5, 4, 9, 34, 6, 4, 5, 7, 4, 5, 6, 7, 2The mode of the scores is 6 7 4 5 25. The table below shows the frequency distribution of a number of pets in 25 houses Find the mode of the distribution 3 2 4 5 1 out of 25 Time is Up! Time's up