In a market research survey of 2504 motorists, 250 said that they made an obscene gesture in the previous month. Complete parts (a) and (b) below. a. If 1 of the surveyed motorists is randomly selected, what is the probability that this motorist did not make an obscene gesture in the previous month? The probability is 0.9002 . (Round to four decimal places as needed.) b. If 50 of the surveyed motorists are randomly selected without replacement, what is the probability that none of them made an obscene gesture in the previous month? Shoul below and fill in the answer box within your choice. (Round to four decimal places as needed.) A. The probability is \( \square \). The \( 5 \% \) guideline should be applied in this case. B. The probability is . The \( 5 \% \) guideline should not be applied in this case.

Jim works at an Auto centre and accidentally drops 4 bad spark plugs into a box with 20 good spark plugs. a. If he selects two spark plugs at random from the box without replacement, and the first spark plug selected was a good one, what is the probability that the second spark plug is bad?

A bag contains green balls and red balls only. A ball is taken at random from the bag. The probability of taking a green ball is 0.38 . Write down the probability of taking a a red ball, b a blue ball.

4. A box contains a total of 100 CDs that were manufactured on two machines. Of them, 60 were manufactured on Machine I. Of the total CDs, 15 are defective. Of the 60 CDs that were manufactured on Machine I, 9 are defective. Let \( D \) be the event that a randomly selected CD is defective, and let A be the event that a randomly selected CD was manufactured on Machine I.

Dalam almari A mmi terdapat beberapa helai baju kemeja-T. I helai berwarna puth, 4 helai berwama hitam, 3 helai berwarna merah dan 3 helai berwarna hijau. Dia memilih schelai baju kemeja-T secara rawak dan didapati kebarangkalian memilih baju hitam ialah \( \frac{2}{9} \). Hitung nilaix: In Azmi's wardrobe, there are few pieces of \( T \)-shirts, \( x \) white shirts, 4 black shirts, 3 red shirts and 3 green shirts. He chooses a \( T \)-shirt at random and the probability of him choosing the black shirt is \( \frac{2}{9} \). Calculate the value of \( x \). A 4 B 6 C 8 D 10

Michelle puts 7 red marbles and 5 blue marbles into a bag. If two marbles are chosen at random from the bag, one by one, without replacement, find the probability that two blue marbles are chosen. \( \begin{array}{ll}\text { A } \frac{25}{144} & \text { C } \frac{7}{22} \\ \text { B } \frac{49}{144} & \text { D } \frac{5}{33}\end{array} \)