Question

1.- A Roads inspector is at a strategic point on the outskirts where, according to statistics, an average of 10 cars per hour drives at an excessive speed.

Distribution = ____________________

a) Find the probability that in one hour exactly 12 cars will drive at excessive speed.
b) What is the probability of at least 2 cars speeding in half an hour.

2.- It is known that 20% of the students on campus are smokers. If a total of 10 students are interviewed, to find out their situation regarding tobacco, determine the probability that at least one of the interviewees smokes.

Distribution = ____________________

3.- A box with 15 Led bulbs for domestic lighting was received. We have just been informed that one of the supplier's employees mixed light bulbs from the original German supplier, with 5 light bulbs (a copy of the first ones) from a Chinese supplier, which by experience is not known to have the same duration or warranty. 3 spotlights will be installed in a boardroom. Find:

Distribution = ____________________

a) The probability that all three are from the German supplier
b) The probability that at least two of Chinese origin will be installed

Answer 1