54 randomly selected students were asked how many siblings were in their family. let x represent the number of pairs of siblings in the student's family. the results are as follows: # of siblings 0 1 2 3 4 5 6 frequency 9 2 18 8 1 5 11 round all your answers to 4 decimal places where possible. the mean is: the median is: the sample standard deviation is: the first quartile is: the third quartile is: what percent of the respondents have at least 1 siblings? % 80% of all respondents have fewer than how many siblings?