Answer:
40
Step-by-step explanation:
Sarah's expenses are 2130/3120×100% = 68.3% of her income.
The amount left over is 100% - 68.3% = 31.7%
Suppose the student guesses the answers, we shall consider this a binomial probability problem of success. This implies that getting a question right is p=1/5.
The number of questions is n=20 questions.
The mean of binomial distribution is
mean=n*p= 20*1/5=4
b] The standard deviation of a binomial distribution is given by:
σ=√(n*p*(1-p))
=√(20*0.2*0.8)
=1.79~1.8
Answer:
μ=4 ; σ=1.8
The x part is 20 because the line is bigger than the other one
Answer:
8-2
Step-by-step explanation:
Q(8, -2)
R(9,0)
S(8, 3)
T(7,0)