Let 
be the random variable for the number of marks a given student receives on the exam.
10% of students obtain more than 75 marks, so
where 
follows a standard normal distribution. The critical value for an upper-tail probability of 10% is
where 
denotes the CDF of , and 
denotes the inverse CDF. We have
Similarly, because 20% of students obtain less than 40 marks, we have
so that
Then 
are such that
and we find
Y-5=m(x+2) is the answer in point slope form
I didn't get to finishing the problem (I just got distracted from my exams lol) but here are the equations for each of the people, if it helps.
S=-6L-2n+198
L=-.25n+33
N=-3.2727L+118.8
Sorry I couldn't be of more help!
Answer:
Y= x-7
Step-by-step explanation:
Answer:
a=35, b=14, c=5
Step-by-step explanation:
b+6=20, b+6-6=20-6, b=14
4c-6=14, 4c-6+6=14+6, 4c=20, 4c/4=20/4, c=5
a triangle's angles always add up to 180, 180-55-90(the square means right angle)=35
