Question

Question 2 A recent survey asks 87 students, How many hours do you spend on the Type numbers in the boxes. computer in a typical day? 10 points Of the 87 respondents, 1 said 1 hour, 5 said 2 hours, 11 said 3 hours, 23 said 4 hours, 19 said 5 hours, 14 said 6 hours, 7 said 7 hours, 5 said 8 hours, 2 said 9 hours. In table format, the results look like this: # hours 1 2 3 4 5 6 7 8 9 # students 1 5 11 23 19 14 7 5 2 What is the average (mean) number of hours spent on the computer? Round your answer to one decimal point.

Answer 1

f are formule to of mean for tobulated data: If the frequencies n abservations a, de – – Dn. to, feito - to, then mean of the tabulated data is = (fast tre + t23 + dow With & fon) Etixi Stixi = ie where naf 0.2+ Thours 1 2 3 4 5 6 7 8 9 students 115/4/23/10/14 7152 Here x= hours and a f = students and x = 1, 12-2, 3-3, x4 = 4, y = 5, 6 = 6, 7, "=8 ng=g. 7 fo=1, tz = 5, f₂ = 11, fq=23, 45= 19, fx=14,47 = 7 to=5, fg 22 - Now, the average (rear) number of hours spent (LX !! +(5)2+(11) 3+(23) + +(19,5 Efe +( 80) (1 9), 6 +677|7+5)8 +2):9 1+5+ 11 +23+19+ 14+7+5+2 It lot 33+92 +95 +84 +49 +40+18 i fini - 87

= 4.8505747126436 Average number of hours 4.9