In the room where you're sitting right now, the angle on the floor
where the bottoms of two walls come together is 90 degrees.
The stem and leaf diagram is shown below
There are a total of 48 data
Question a:
The frequency in the stem for 9 to 9.9 is 13 data
Question b:
The location of the first quartile is given by
![\frac{n+1}{4}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bn%2B1%7D%7B4%7D%20)
, where 'n' is the number of data
We have n = 48
Location of the first quartile is at
![\frac{48+1}{4}= \frac{49}{4}= 12.25](https://tex.z-dn.net/?f=%20%5Cfrac%7B48%2B1%7D%7B4%7D%3D%20%5Cfrac%7B49%7D%7B4%7D%3D%20%2012.25)
rounded down to 12
The value of the lower quartile is on the
![12^{th}](https://tex.z-dn.net/?f=%2012%5E%7Bth%7D%20)
on the diagram which is 8.7
We go from 10x+20 = 50 to 10x = 30 after we subtract 20 from both sides. So we use the subtraction property (of equality).
Answer: Choice D
I think the answers a
hope this helps :)
(if you wouldn’t mind can you mark me brainliest?)