13, 15, 25, 55, 123, ?

Find the value of A, if the mode of the following data is 20: 15, 20, 25, 18, 13, 15, 25, 15, 18, 17, 20, 25, 20, lambda ,18.

5, 11, 25, 55, 117, 243, ….

Find the mode of the following data: 12, 14, 12, 16, 15, 13, 14, 18, 19, 12, 14, 15, 16, 15, 16, 16, 15,17, 13, 16, 16, 15, 15, 13, 15, 17, 15, 14, 15, 13, 15, 14

69, 55, 26, 13, 5

In the data 18, 13, 15, 13, 18, 14, 15, 13, 14, 15, how many times the number '15' repeats itself?

14 13 22 55 212 1035

Which number should be subtracted from each of the numbers 13, 25 and 55 so that the resulting numbers would be in continued proportion?