Question

400 школьников решали контрольную работу,причем 56 из них выполнили все задания верно.Какова вероятность того,что выбранная наугад работа имеет хотя бы одну ошибку?ответ указать с точностью 0,01

Answer 1

56/400=0.14
1-0.14=0.86

Answer 2

400-56=344-Школьников допустившие ошибки
344/400=172/200=86/100 или 43/50

Answer 3

Problem Statement

400 students took a test, and 56 of them answered all the questions correctly. We want to find the probability that a randomly chosen test has at least one error, with a precision of 0.01.

Solution

To find the probability that a randomly chosen test has at least one error, we can use the complement rule. The complement rule states that the probability of an event occurring is equal to 1 minus the probability of the event not occurring.

Let's calculate the probability of a randomly chosen test having no errors. Since 56 students answered all the questions correctly, there are 400 - 56 = 344 students who made at least one error.

The probability of a randomly chosen test having no errors is given by:

P(no errors) = (number of tests with no errors) / (total number of tests)

**P(no errors)