Answer:
The average weekly grocery bill per four-person family in the town is significantly different from the national average.
Step-by-step explanation:
We are given the following in the question:
Population mean, μ = $100
Sample mean,
= $103.23
Sample size, n = 25
Alpha, α = 0.05
Sample standard deviation, s = $8.82
First, we design the null and the alternate hypothesis
We use Two-tailed t test to perform this hypothesis.
Formula:
Putting all the values, we have
Now,
Since,

We accept the null hypothesis.
We accept the null hypothesis and determine that the average weekly grocery bill per four-person family in the town is significantly same to the national average.
Answer:
10:17
Step-by-step explanation:
The number of apples in the fridge is 10
The total number of apples is 17 (10+7)
The question is asking for the ratio of apples in the fridge to all of the apples
So, The ratio would be 10:17
Hope this helps!
Answer:
a) x = 10
b) x = -40
c) x = 10, -40
Step-by-step explanation:
a)

Taking 10 to the right hand side 10 becomes positive

So x = 10
b)

Taking 20 to the right hand side 20 becomes negative

Multiplying both sides by 2

So, x = -40
c)

Hence, x = 10, -40
So, two solutions can be provided