Question

1. If a set of data has a standard deviation of 3 and a mean of 12. What is the value at z=2?

2. If a set of data has a standard deviation of 3 and a mean of 12. What is the value at z=0?

3. The interquartile range of the data set {5,6,7,7,9,13,15,17,18,18,19,20,32} is

4. If a set of data has a standard deviation of 3 and a mean of 12. What is the value at z=-1?


PLEASE HELP thank you

Answer 1

You can play around with Z table stuff at
davidmlane.com/hyperstat/z_table.html


as for #3,
the median is 15
the median of the bottom 6 values is 7
the median of the top 6 values is 18.5
so the IQR is 18.5 - 7 = 11.5