Christopher recorded the grade-level and instrument of everyone in the middle school School of Rock below. Seventh Grade Students Instrument Guitar Bass Drums Keyboard # of Students 11 11 4 10 Eighth Grade Students Instrument Guitar Bass Drums Keyboard Based on these results, express the probability that a student chosen at random will play an instrument other than drums as a fraction in simplest form. # of Students 10 7 15 14

(co 3) the times that customers spend in a book store are normally distributed with a mean of 39.5 minutes and a standard deviation of 9.4 minutes. a random sample of 25 customers has a mean of 36.1 minutes or less. would this outcome be considered unusual, so that the store should reconsider its displays? no, the probability of this outcome at 0.035, would be considered usual, so there is no problem yes, the probability of this outcome at 0.035, would be considered unusual, so the display should be redone no the probability of this outcome at 0.359 would be considered usual, so there is no problem yes, the probability of this outcome at 0.965 would be considered unusual, so the display should be redone