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. The following marks were obtained by candidates in an examination What is the modal group 41-50 61-70 51-60 71-80 2. Find the mean and mean deviation, respectively of the following 5, -3, 6, -2, 4, -8, 4, 7, -10, 10 4.3, 2.64 2.3, 4.64 1.3, 5.64 3.3, 3.64 3. The following data gives the heights to the nearest metre of 55 treesCalculate the interquartile range 10.98 12.73 22.98 20 4. 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 5. For the set of numbers:1, 2, 3, 4, 4, 5, 6, 7, 8, 10the mean, mode and median are, respectively 5, 4 and 4 5, 4 and 4.5 4.5, 4 and 4.5 4.5, 4 and 5 6. The marks scored by students in a test are recorded in the table belowCalculate the median 4 3 6 5 7. Find the mean and mean deviation, respectively of the following 16, 18, 12, 14, 20, 25, 13, 15, 11 8. 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 N800 N1,000 N400 9. 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. 148.4 170 129.4 87.4 10. 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 N8,888.89 N4,290.23 N353 N7,354.34 11. The average marks scored by 10 girls and 15 boys in a Physics test were 60 and 55, respectively, the average mark for the 25 students is 24 57 54 67 12. For the set of numbers4, 6, 2, 10, 8, the difference between the range and the variance is 0 2 1 -1 13. The variance and standard deviation of the set of numbers-4, -2, 0, 2, 4 are, respectively 0, 0 8, 2.8 4, 2 64, 8 14. 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? 3 5 7 1 15. Find the mean and mean deviation, respectively of the following -3, -5, -7, 2, 5, 0, 4, 6 0.35, 3 0.25, 4 1.72, 1.12 4, 0.35 16. Find the range of the following data1/4, 5/8, 3/10, 2/5, 7/10, 7/8, 3/4 7/10 3/5 3/4 5/8 17. 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 5 3.5 4.5 4.8 18. The marks scored by students in a test are recorded in the table belowCalculate the standard deviation 1.84 1.34 2.13 2.34 19. Number 1 2 3 4 5 Frequency 1 3 2 3 1The variance of the frequency distribution in the table above is 1.2 1 1.5 1.4 20. The scores of a group of five students are4, 5, 6, 7, 8.The mean deviation is 1.0 1.5 2.0 1.2 21. 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 24 yr 21 yr 20 yr 22. Find the range of the following datax+2, x-5, x+6, x-2, x-7, x+3, x-10, x-1 x+4 12 x-2 16 23. 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 standard deviation of the salaries of the 20 people. 2.3 6.7 11.0 9.9 24. 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 5 3 4.5 5.5 25. 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? 180 degrees 270 degrees 225 degrees 240 degrees 1 out of 25 Time is Up! Time's up