Answer:
I think ti is 15 i fi am wrong I am sorry
Answer:
400
Step-by-step explanation:
8 out of 10 remember their chargers ( multiply by 10 )
80 out of 100 remember their chargers ( multiply by 5 )
400 out of 500 remember their chargers
Well, "of" means multiply so, you would divide 1 by 10 to get .1 then multiply that by 3 and get .03
The monthly failure rate is q = 5% = 0.05
The monthly pass rate is p = 1 - q = 0.95
We want to determine the probability of 12 passes in 12 consecutive months for a student.
P(12 of 12 successes) = ₁₂C₁₂ p¹² q⁰ = 0.95¹² = 0.5404.
Therefore if we have 100 students, the number that gets through 12 consecutive months is
100*005404 = 54 students.
Answer: 54 students are left after 12 months.
By solving for x you get x=6