Aleading dental journal claims that 63% of young adults do not brush their teeth regularly. a dental hygienist wants to conduct a survey to verify this with her young adult patients, and wants to do so with a margin of error (me) of ± 9%. what minimum sample size, rounded to the nearest whole person, does the hygienist need to use?

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent.the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244