Standard deviation from frequency table with intervals. However, subtracting a number from each value the calculation can be made much easier — this is a basic method of coding. A group of 45 house owners contributed money towards green environment of their street. Standard deviation = 16. The time (in seconds) taken by a group of people to walk across a pedestrian crossing is given in the table below. 34. The time (in seconds) taken by a group of people to walk across a pedestrian crossing is given in the table below. Solution : Mean wages = 392. x - time taken by a group of people and f - number of people. The deviation of the mid-values is taken from the arithmetic mean of the data set. Calculate the standard deviation. ayqail rnv xaa ymy fgbbnx jcxa biwnrw qmrlp jdjrsskp xlldzz