These are my screenshot taken Questions taken for today's session.

100. A group of high school students are volunteering for Habitat for Humanity during their summer break. They are putting the finishing touches on a house they built. Working alone, Joe can paint a certain room in the house in 7 hours. Anna can paint the same room in 6 hours. How many hours will it take them to paint the room together?98. The performance reviews for several employees at a company are shown in the box-and-whisker plot below. What is the Inter Quartile Range (IQR) of performance reviews? Performance Reviews 52 56 60 64 68 72 76 80 84 88 92 96 10096. Among companies doing highway or bridge construction, 70% test employees for substance abuse. A study involves the random selection of 10 such companies. Find the probability that 8 of the 10 companies test for substance abuse.89 When two coins are tossed, what is the probability that they are both heads? 90. When P(A or B) = P(A) + P(B) , events A and B must be: a. Independent b. Impossible c. Mutually Exclusive d. Unlikely