Question

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answ at best completes the statement or answers the question. 1) If the mean of five values i 8.8 and four of the values are 6, 7.6, and 12, find the fifth value. A) 13 B) 31 C) 9 D) 14 2) What is the median of the following set of values? 7,21,19,15,19,14,15,19 A) 15 B) 17 C) 13 D) 19 3 The number of police officers in selected city districts is listed below. Find the mode. 24, 26, 24, 30, 23, 28, 19, 31, 24, 26, 19 A) 23 B) 26 D) 24 C) 28 4) What is the midrange of the following data set? 7, 13, 12, 14, 6, 14, 20, 20,20 A) 13 B) 20 C) 7 D) 14 5) 5) The average age of Stokes County school board members over the last 40 years has been 51, but members have ranged from 32 to 67. Use the range rule of thumb to estimate the standard deviation of the members' ages. A) 50 B) 8.8 C) 24.8 D) 17.5 6) A single card is drawn from a deck. Find the probability of selecting a heart or a 8. 6) B) 32 7) 7) Let E be the event that a com crop has an infestation of ear worms, and let B be the event that a corn crop has an infestation of corn borers Suppose that P(E) = 0.18, P(B) = 0.11, and P(E and B) = 0.06. Find the probability that a corn crop has either an ear worm infestation, a com borer infestation, or both. A) 0.35 B) 0.06 C) 0.71 D) 0.23

Answer 1

1)

fifth value =8.8*5-(6+7+6+12)=13

2)

median =middle value =(15+19)/2 =17

3)

mode =24

4)mid range =(max+min)/2 =(20+6)/2 =13

5)

std deviation =range/4 =(67-32)/4=8.8

6)

P(heart or a 8 )=16/52 =4/13

7)

P(E u B) =P(E)+P(B)-P(E n B) =0.18+0.11-0.06 =0.23