What is the first quartile, q1, of the data set?
{23, 28, 28, 36, 56, 60, 61, 65, 70}
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q1 =

Step-by-step explanation:

Given data :-{23, 28, 28, 36, 56, 60, 61, 65, 70}

The number of observations n =9

We know that the position of median is given by :-

Now, for n=9,

where does the z at is it on the x axes or on the y axes any way if it is on the y axes put it horizontally and if it is on the x axes put it vertically