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The fourth number is 10. The sum of the four numbers is: 12 + 50 + 48 + fourth_number = fourth_number + 110 Mean = sum_of_numbers / how_many_numbers → sum_of_numbers = mean × how_many_numbers = 30 × 4 = 120 But from above: sum = fourth_number + 110 = 120 → fourth_number = 120 - 110 = 10
When blank = 1, the number is 110. That is,: 110, when divided by 1 is 110.
The number than when squared equals 110 is the square root of 110 = ±10.488 (3dp)
110 is a natural number.