The mean of first 11 terms of Fibonacci sequence : 1,1,2, 3, 5, 8, 13, 21, 34, 55, 89 is 21.1. Calculate the standard deviation.

The first three terms of a sequence are 3,-1,-1 . The next terms are

Which term of the sequence 24, 23 1/4, 22 1/2, 21 3/4, ….. is the first negative term ?

which term of the following sequence : 1/3^1 , 1/3^2 , 1/3^3 ...is 1/3^5 ?

Which term of the sequence : 20,19 1/4, 18 1/2, 17 3/4 , ..... is the first negative term ?

The largest term common to the sequence 1,11,21,31,….to 100 terms and 31,36,41,46,…… to 100 tetms is

Find the sum of the first n terms of the series: 3+7+13 +21 +31 +...

From a frequency distribution consisting of 18 observations, the mean and the standard deviation were found to be 7 and 4 respectively. But on comparison with the original data, it was found that a figure 12 was miscopied as 21 in calculations. Calculate the correct mean and standard deviation.

Find the mean deviation from the median for the following data : 9, 12, 18, 3, 5, 3, 10, 12, 21, 12, 21.

Find the mean deviation from the median for the following data : 10, 3, 12, 5, 9, 3, 18, 21, 21, 8, 12, 12.