Question

7. 2000 adults were asked if they have ever shopped online. The results are Have shopped 900 700 Haven't shopped 300 100 Male Female An adult is selected randomly. Find the a. P(hasn't shopped online or is female) b. P(is male or has shopped online) c. P(has shopped online or hasn't shopped online) 12 oo ties 8. The mean time taken by the participants in a road race is 220 minutes (std. dev. 20 min). Use Chebyshev's Theorem to find the minimum percentage of those who completed the race in: a 180 to 260 min. b. 170 to 270 min. 9. From a group of 11 people, two are chosen to go on a trip. Calculate how many ways this can be done. Now, if one of them is in charge of the trip, how many ways are there?

Answer 1