You can use the midpoint formulae as I have in the picture below
The text tells us 215 is 86% of the questions
We are looking for 100% of the questions
We get that number by:
Multiplying 100 and 215 and dividing it by 86

And that equals 250
Answer: for the 12,13,40,95,88,7,95
mean 95,median 83,mode 95
Step-by-step explanation:
Answer:
d
Step-by-step explanation:
Answer:
x=11
Step-by-step explanation:
You do 38/3x+3 and 19/x+7 and then cross mulitply and get 57x+57=38x+266. Then yoy subtract 57 from 266 and get 57x=38x+209. Now you have to subtract 38 from 57 and then answer will be 19. So now you have 19x=209. Finally you divide 209 by 19 and get x=11. Good luck!