You need to include the question not just the explanation.
Answer:
Step-by-step explanation:
y=x-2
x+(x-2)=4
2x-2=4
2x=6
x=3
What is thiissssssssssssss
Answer:
0.7262
Step-by-step explanation:
Let random variable = X
Probability of getting a cookie with at least 55 chips:
P(55≤ X ≤78), where X1 = 55 and X2 = 78
Let mean, U = 66 and standard deviation, S.D. = 10
Let Z = X - U/S.D; Z1 = X1 - U/S.D and Z2 = X2 - U/S.D
Z1 = 55 - 66/10 = - 1.1
Z2 = 78 - 66/10 = 1.2
P(X1≤ X ≤ X2) = P(X1 -U/S.D ≤ X - U/S.D ≤ X2 - U/S.D)
P(Z1 ≤ Z ≤ Z2) = P(0 ≤ Z ≤ Z1) + P(0 ≤ Z ≤ Z2)
Hence, (55 ≤ X ≤ 78) = P( - 1.1 ≤ Z ≤ 1.2)
∴ P(-1.1 ≤ Z ≤ 1.2) = P(0 ≤ Z ≤ 1.1) + (0 ≤ Z ≤ 1.2)
= 0.3413 + 0.3849 = 0.7262
Ok, let's find how much does 1 yard of ribbon cost. Let's divide!
![6 / 4 = 1.5](https://tex.z-dn.net/?f=6%20%2F%204%20%3D%201.5)
Each yard costs $1.50, so let's multiply that by 10
![1.5 * 10 = 15](https://tex.z-dn.net/?f=1.5%20%2A%2010%20%3D%2015)
Marci will pay $15 for 10 yards of the ribbon.