Question

Среднее арифметическое четырех чисел равно 6. Первые три числа равны 3.4 7.7 и 8.9 чему равно четвертое число?помогите пожалуйста! заранее спасибо

Answer 1

Ответ:

Пошаговое объяснение:
(3,4+7,7+8,9+х):4=6
20+х=6*4
20+х=24
Х=24:20
Х=1,2
Х - четвёртое число

Answer 2

Calculating the Fourth Number

To find the fourth number when the average of four numbers is 6, and the first three numbers are 3.4, 7.7, and 8.9, we can use the formula for calculating the average:

Average = (Sum of all numbers) / (Number of numbers)

Given that the average is 6 and the sum of the first three numbers is 3.4 + 7.7 + 8.9, we can calculate the fourth number using the formula:

Fourth number = (Average * Number of numbers) - (Sum of the first three numbers)

Substituting the given values: Fourth number = (6 * 4) - (3.4 + 7.7 + 8.9)

Calculation

``` Fourth number = (6 * 4) - (3.4 + 7.7 + 8.9) = 24 - 20 = 4 ```

Therefore, the fourth number is 4.