Question

Elementary Statistics Study Guide 3 Due Date: Name: Angelica Miranda Class: stats-06270 Score: No Work - No Points Use Pencil Only Be Neat & Organized 1. The incomplete frequency distribution table given below represents the score of an exam in a math class. (a) (5 points) Complete the frequency distribution table below: Glass Dil Cumulative Percentage Class Limits Boundaries Midpoint Frequency Frequency Frequency Width:13 n = 40 10 55 - 67 545-67.5 61 68 - 80 075-805 74 81 – 93/805-935 87 16 | 29 4 0 22.5% 40% 1754, 94 – 106 935-1065 100 11 (b) (1 point) Find the number of classes in this frequency distribution table (e) (2 points) Find the class width for this frequency distribution table. (c) 13 (d) (2 points) How many students took this exam? (d) (e) (2 points) what percentage of the scores are between 68 and 93, inclusive 22.5 t. 40% - (0) 62,5% Study Guide 3 Total Points: 50 Page 1 of 4

Answer 1

9.2. Solution 18 20 82, 98,70,65. go, 76, 67,85 a) x € mean) = sum of observation divide by no. of observation (82+98+ 80 +65 +90+ 76 +67 +851 8 = 79.125 (6) reduced fraction for ² means sum of square of deviation about around the mean mean of sample is x=79 ,n28 2- E (xi-x)? 82- + (82-7952+(88-79)+(70-49)2+(65-79)2+(90-79)+(76-797 +(67-79) ²+ (85-79)27 n-1 12 - 9+361 +81 + 196+121+9+144 +36 = 136.71 .

slution @ L score of exam Pn math class. class width=13 total = 40 class class class class cumulative of limits boundaries midpoint frequency frecuency frequency 55-64 545-67.5 61 4 10 68-80 | 81-93 94-106 167.5 80. 5 74 80.8-98.5 87 93-5-1005 100 9. 26 | 13 22.5 29 1 40 27.5 Note! Here classe are continuous midpoint = class (addition) 40 n=40 * % frequency = class frequency x 100 = eig. I x 100 = 20% cumulative fregna The distribution that shows the number of observations less than or equal to a specific value ceag. 13 +16=29: 29+14240) There are 4 classe in frequency table 2 class width for this frequency table is (23) boundering class width= o upper bont class - lower kennent class boundaries - 6 25 55513 * ea 805685=13 & 93581.5=13 & 106594.5=23 od there are 140 students took this exam. . 22.5+ 40 = 162.5% are scrove been 68 and 93.