Problem 2: Concrete beams can fail in flexural mode or shear mode. A structural lab has 15 failed concrete beam - 9 of which failed in flexural mode, 6 of which failed in shear mode. • How many ways are there to randomly select 6 of these beams for a thorough inspection (without worrying about the order)? (2 points) • In how many ways can a sample of 6 beams can be randomly selected, so that exactly 5 of them failed in shear mode? (2 points) • If a random sample of 6 beams is selected, determine the probability that atleast 5 of them failed in shear mode? (3 points)

my acc plz

step-by-step explanation:

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

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answer: d.) the total number of protons and neutrons is 15

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