please answer all questions

Q 1) Find the mode of the following grouped data: Class intervals Frequency 5-20 9 20-35 4 35-50 50-65 9 65-80 6 Q 2) Find the mean, median and mode of this grouped data: CI 0-10 10-20 20-30 30-40 40-50 f 2 5 7 6 5 Q 3) Create a frequency distribution table given the following sample of 29 students who got the following marks in Test. 1 of Basic Business Statistics. 5,8,9,10,11,12,13,14,15,16,6,9,8,10,16,19,19,18,18,19,7,7,6,9,8,13,17,18,19 Q 4) Find the populations mean, variance and standard deviation of the following population values: 3, 6,9,12 and 15. Q 5) Find the sample mean, variance and standard deviation of the following values of data: 2, 4, 6, 8, and 10. Q 6 A student received an A grade in Arabic Language (3 credits hours), a B in English for Business (3 credits ), a C in Introduction of Managerial Accounting (3 credits ), a D in Financial Management (3 credits ), and an A in Computer (5 credits), Assuming A=4, B=3, C=2, D=1 grade-point, Find the student's grade point average. 0 7) Find the population standard deviation of the following population values: 10, 60, 50, 30, 40, 20 Q 8). Find the z score for each test and state which is higher. Test A x = 38 x = 40 s = 5 Test B x = 94 x = 100 S = 10 Q 9).A teacher gives a 25 marks test to 15 students. The marks are shown here. Find the percentile rank of a mark of 19. Also find the coefficient of variation. 18,15,12,22,24,25,19,18,17,5,8,8,13,16,21