Ten percent of all electrical batteries are defective. In a random selection of 8 of these batteries, find the probability that (a) There are no defective batteries. (b) More than 15 percent of the batteries are defective. (c) Between 8 and 12 percent of the batteries are defective. Suppose there was a random selection of n = 50 batteries in Prob. 2. Determine approximate probabilities for parts (a), (b), and (c) of that problem.

Trigonometry help asap

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list