<span>The solution:
= 40, p = q = 0.5
P[x] = nCx *p^x *q^(n-x)
when p = q = 0.5, the formula simplifies to
P[x] = nCx/2^n = 40Cx/2^40
at least 18 of each type means 18 to 22 of (say) type I
P(18 <= X <= 22) = 0.5704095 <-------
qb
mean = 40*0.5 = 20
SD = sqrt(npq) = sqrt(40*0.5*0.5) = 3.1623
z1= (18-20)/3.1623 = -0.63 , z2 = (22-20)/3.1623 = 0.63
P(-0.63 < z < 0.63) = 0.4713 <-------</span>
Answer:
B. 4
Step-by-step explanation:
A direct proportion has the form
y = kx or k=y/x,
where k is the proportionality constant.
Let's test some points.
Second point
k = 8/2 = 4
Fifth point
k = 23/5.75 = 4
You will get the same result for every point, so the constant of proportionality is 4.
Top left graph. Shows every gallon of gas gets 25 miles.
