Step-by-step explanation:
two answers either
x = 8
or
x = -1
Answer:
Step-by-step explanation:
Given data:

standard deviation is 
As distribution is normal in shape and values are symmetrical
The standard deviation rule says that 95% of observation lies between the second standard deviation of the mean
so, approximately only 5% of observation lies outside the interval and normal shape is symmetric. hence approximately 0.15% of observation lies above the interval


almost 0.15% of students spent more amount is 529
Questions are USUALLY answered within 10 minutes.
Therefore, you're questions might be complicated, hard, or incomplete.
Actual people are answering these questions, so obviously the easier questions get answered first.
Answer:
I want to help you but I'm trying to sign into to brainy and I have to answer someone, sorry for being a noucance
It's too blurry take another picture