Welcome to your Statistics(Senior Class Maths Study by Topics) NAME EMAIL PHONE NUMBER 1. The marks scored by students in a test are recorded in the table belowCalculate the median 5 6 3 4 2. 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, 23 5, 23 6, 10 11, 33 3. The following table shows the grouped data, in classes, for the heights of 50 people. height (in cm) - classes frequency 120 <- 130 2 130 <- 140 5 140 <- 150 25 150 <- 160 10 160 <- 170 8 Calculate the mean of the salaries of the 20 people. 87.4 148.4 170 129.4 4. 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 modal score is 5 7 4 6 5. 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 N56,000 N214,000 N40,000 N116,000 6. The distribution of a housewife's expenditure on four food items is as follows:Item A (£80), Item B (£45), Item C (£30), Item D (£25). The sum of the angles of the sectors representing the expenditure on items B and D is 220 90 140 70 7. The following data were obtained from the analysis of six observations of a variable x.n = 6, ∑x = 42, ∑x² = 348∑|x-ẋ| = 18, ∑(x-ẋ)² = 70The mean deviation and the variance are, respectively 3 and 11.7 0.4 and 3 3 and 1.7 2.3 and 5 8. The average age of 4 children is 15 years. If the ages of their parents are added, the average age is 25. What is the age of the father if he is 4 years older than his wife? 35 yrs 47 yrs 46 yrs 42 yrs 9. 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 mean of the salaries of the 20 people. $2055 $1955 $955 $3955 10. The pie chart illustrates the distribution of number of married men (M), married woman (W), bachelors(B), spinsters(S) and children(C) at a social event.The angle of the sector representing spinsters is 24° 45° 48° 36° 11. The mean weights of three groups of students are 40kg, 45kg and 50kg respectively. If the number of students in the groups are 45, 30 and 25 respectively,the mean weight of all the students is 46 kg 43 kg 45 kg 44 kg 12. Find the range of the following datax+2, x-5, x+6, x-2, x-7, x+3, x-10, x-1 x-2 16 x+4 12 13. The distribution of grades in a Mathematics examination taken by a class of 72 students is represented on a pie chart.If 54 students passed the examination , the angle of the sector corresponding to the number of failures is 90 degrees 45 degrees 120 degrees 60 degrees 14. The table below shows the frequency distribution of a number of pets in 25 houses Find the median of the distribution 3 7 4 5 15. The table below shows the heights to the nearest cm of a group of peopleCalculate the range of the distribution 29 cm 39 cm 59 cm 49 cm 16. 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).The amount spent on miscellaneous items is N17,500 N25,000 N16,000 N20,000 17. The mean of 25 numbers is 8. If the largest value 32 is removed, what is the mean of the remaining numbers? 5 6 8 7 18. Find the variance and the standard deviation, respectively of the data below-3, -5, -7, 2, 5, 0, 4, 6 12.6, 19 12.3, 17 4.52, 20.2 20.4, 4.52 19. 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 228 degrees 276 degrees 48 degrees 84 degrees 20. 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 median of the distribution is 10.5 9.5 11 10 21. The weights to the nearest kg of a group of students are recorded in the following tableCalculate the median weight 43.4 kg 52.5 kg 56.4 kg 24.5 kg 22. 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? N600 N1,000 N400 N800 23. 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 2What is the mode of the distribution? 9.0 8.8 9.8 8.0 24. The following data gives the heights to the nearest metre of 55 treesUsing a working mean of 18 or otherwise, calculate the standard deviation 7.1 m 10.3 m 8.3 m 11.2 m 25. The following data gives the heights to the nearest metre of 55 treesUsing a working mean of 18 or otherwise , calculate the mean height 14.7 10.0 32 22.9 1 out of 25 Time is Up! Time's up