The given data set is:
37, 4, 53, 79, 25, 48, 78, 65, 5, 6, 42, 61
We arrange the data set in ascending order of magnitude {4,5,6,25,37,42,48,53,61,65,78,79}
The median is 45.
The lower half of the data set is
{4,5,6,25,37,42}
The first quartile is the median of the lower half set;
The upper half of the data set is:
{48,53,61,65,78,79}
The median of the upper half is .
The inter-quartile range
8. The given data set is 112, 149, 112, 148, 139, 121, 116, 134, 148.
The mean of the data set is
The standard deviation is given by:
The standard deviation is 15.0 to the nearest tenth.