The answer is 50
X represents a toaster, x-20 represents a rice cooker
Use the equation 5x+3(x-20)=500
Solve for x and get 70.
A toaster is 70 but a rice cooker is 50
example:all students are 39
students with same grade are 16
so
Re arrange the second equation...
2y=4x+6
Divide all through by 2 to get
Y=2x+ 3
Two lines are parallel if they have the same gradient and since both of their gradients are two it means that they are parallel
We are going to use a continuity correction factor. When you use a normal distribution to get the estimated binomial distribution, you're going to have to use a continuity correction factor. So with this, the data will become from <span>20 - 35 it will now become 19.5 to 35.5.
So we are going to use the z table for this problem. So if we are looking for the z value, the formula would be: </span>x – μ / σ<span>
get the value of the first z value:
</span>z1 = (19.5 - 30) / 9 = -1.167
get the value of the second z value:
<span>z2 = (35.5 - 30) / 9 = 0.61
</span>
So getting the probability of both:
P(-1.167 < z < 0.61) = P(Z ≤ b) – P(Z ≤ a) = <span>0.6075</span>