Assume that 60% of people are left-handed. if we select 5 people at random, find the probability of each outcome described below, rounded to four decimal places: a. there are some lefties ( ≥ 1) among the 5 people. 9898 b. there are exactly 3 lefties in the group. 2304 c. there are at least 4 lefties in the group. d. there are no more than 2 lefties in the group. e. how many lefties do you expect? f. with what standard deviation?

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.