How do you do question 2F, 4 & 5?? Im not sure if my answers for 4 & 5 are correct. Question 2F, the answer results in -4.34 however, you can't find that on the percentile table so please help. Module 5 - Statistics

Class Activity 5 Q2. Final exam marks of the students registered in Chem 1202 at MRU has a normal distribution with average of 78% and standard deviation of 5.3%. a) Find the z-score of mark of a student who scored of 92%? b) Find the mark of a students whose z-score is -1.4? c) Find the z-score of mark of a student who scored 92%? d) What percent of students scored higher than 60%? e) What percent of students scored lower than 70%? f) What percent of students scored between 55% and 75%? mean = 78% OD = 5:30 a ) 0.92 - 0. 78 - 2. 64 0- 053 6) z+score = ( x ) - 60. 78 ) = = 1,4 c) 2 - Scare = 0.9 2 - 0 .78 F2, 64 0 05 3 010 53 * = (0. 78 ) = 6-1. 4 ) (0. 053) x - (0. 78 ) = (-0. 0742) 1X = 70. 580 d ) z = 0. 6 - 0 .78 = - 3.40 - 7 1- (0.0003) = 0. 9997 0 .05 3 = 0.000 3 = 99 . 97 % e ) 2 = 0. 7- 0. 78 = - 1.51 0 053 =0.0655 1- 7=6 . 55 0 F) 2-=0.55- 0-78 - -4.34 2 7390 = 0. 75 - 0.78 - - 6.57 0 10 53 010 53Class Activity 5 Q4. Considering the following two distributions, which statement is correct? of SD of the distribution A is larger than that of distribution B. b) Mode of the distribution A is larger than that of distribution B. c) Range of the distribution A is smaller than that of distribution B. d Mean of the distribution A is larger than that of distribution B. A data item with z-score of -1 falls between 30 to 40 in distribution A. fy A data item with z-score of +1 falls between 10 to 20 in distribution B. A B 10 30 4b 50 60 30 80 90 100 - 1r = 191589 1696 x 3226 30 Class Activity 5 J( 2709316 - 94 345 ) (10907076 - 347 145) 50 Q5. In a research, blood pressure of a sample of people have been measured and plotted against their age, as shown below. Which statement is correct? a) The scatter plot indicates a perfect negative correlation. b) The scatter plot indicates approximate r = +0.95. c) The scatter plot indicates that older people tend to have higher blood pressure. d) If this data is fitted to a linear line of regression, the Y-intercept will be a positive. 140 y = my + b 135 130 125 Systolic blood pressure (mmHg 11 90 80 40 45 50 55 60 65 70 Age (years) X 2 126 X 2 X 2 15876 44 88 61 1 10 1936 3660 774 4 1 2100 45 100 112 2025 38 49 10600 16129 47 6.2 127 2 209 38 49 8836 94 49 63 12 2 3721 9025 95 2 401 49 3 721 98 63 9 60 4 97 120 2401 51 3969 9 409 66 12n 2601 3969 10816 50 15376 2601 4096 11236 51 106 52 70 135 2500 4356 10 201 179 56 101 95 2704 4761 9025 18 225 2916 4900 10816 55 105 N y 2809 94 545/ 11025 3471 4 58 102 3025 57 109 1646 3226 3 364 11857 113 3249 12769 2 709316 10407076 3249 56 13225 116 125 13456 60 115 N = 30 3249 1 5625 3136 1 32 25