Answer:
b
Step-by-step explanation:
Answer:
He needs about 12.5 gallons with 0.5 left over.
Step-by-step explanation:
We need to find the unit price of each box.
So, a box that weighs 30 Oz costs $4.50.
lets say that 30 Oz box is named box 1. We can use unitary method to find out the unit price of box 1.
Unitary method is a process to find the value of a single unit.
Now,
30 Oz costs $4.50
therefore, 1 Oz should cost:
dollars
So, the unit price of box 1 is $0.15.
Now, lets say the 20 Oz box is named box 2. Again we can use unitary method to find out the unit price of box 2.
Now,
20 Oz box costs $3.60
therefore, 1 Oz should cost:
dollars
So, the unit price of box 2 is $0.18.
Answer:
Step-by-step explanation:
Given that in a rural area, only about 30% of the wells that are drilled find adequate water at a depth of 100 feet or less.
The sample size n = 80
no of wells less than 100 feet deep=27
Sample proportion = 
a) Create hypotheses as

(Right tailed test)
p difference 
Std error of p = 
b) Assumptions: Each trial is independent and np and nq >5
c) Z test can be used.
Z= p diff/std error = 
p value = 0.233
d) p value is the probability for which null hypothesis is false.
e) Conclusion: Since p >0.05 we accept null hypothesis
there is no statistical evidence which support the claim that more than 30% are drilled.
The difference = 6.5 - 5
the difference = 1.5
percentage = 1.5/5 × 20/20
percentage = 30/100
percentage = 30%