Question

Question 11 1 pts The distribution of “problem cases" that the Division Dean gets in a day is given by: Number of calls o 1 2 3 4 5 P(N) 0.17 0.24 0.32 0.11 0.09 0.07 The expected number of "problem cases" the Division Dean gets in a day is O 1.92 O2 3.2 O 0 2.5 Question 12 4 pts Assume the amount of time statistics students spent studying for the Math 10 final exam is exponentially distributed with a mean of 4.2 hours. Eighty percent (80 %) of students studied more than how many hours? 0.9 3.4 0 6.8 O 7.6

Answer 1

Page No. Data: in a the problem cases Let t' denotes day € (x) Σκρ(και) 0x 0.17 + 1 x 0.24 + 2x0.32 + 3 x 0.l1 + 4x0.09 + sxo.07 0+ 0.24+ 0.64 + 0.33+ 0.36+ 0.35 1.9.2 € (x) = 1.92 Given: 4.2 = mias so, m= 1 = 1 4.2 Now let students x denotes the studied of hours h; P[x > x] 1 - Pl xan] 1- (1 - e-mx) 0.80 0.80 0.80 .mn e 0.80 -x/4.2 = 0.80 log [ e-114.27 log[0.80) -x -0.2 231 4.2 2 = 0.93 702.