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nika2105 [10]
3 years ago
12

Try Again

Mathematics
1 answer:
jek_recluse [69]3 years ago
5 0

Answer:

$34.30

Step-by-step explanation:

Use the equation:

F=P(r)

F=final price

P=principal (starting) amount

r=rate, normally a percent and has to be converted to a decimal

**Since this problem asks us to go down, there is no 1+r. That's when it gives us the final price and asks us to find the original.

Plug in the values: F = 49(.7)

F=$34.30 (don't forget the $ sign)

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The mayor is interested in finding a 95% confidence interval for the mean number of pounds of trash per person per week that is
baherus [9]

Answer:

(30.09, 32.91)

Step-by-step explanation:

Mean number of pounds of trash = x = 31.5 pounds

Standard deviation = s = 7.8 pounds

Sample size = n = 120

Confidence level = 95%

Since, we are given the sample standard deviation instead of the population standard deviation, we will use t-test to find the confidence interval.

Degrees of freedom = df = n - 1 = 120 - 1 = 119

The t-value associated with 95% confidence interval and df=119 from the t-table comes out to be:

t = 1.98

The formula to calculate the confidence interval is:

(x-t\frac{s}{\sqrt{n}}, x+t\frac{s}{\sqrt{n}})\\

Using the values in above expression we get:

(31.5-1.98\times\frac{7.8}{\sqrt{120}}, 31.5+1.98\times\frac{7.8}{\sqrt{120}})\\\\ =(30.09,32.91)

Thus, the 95% confidence interval for the mean number of lbs of trash per person per week that is generated in the city is (30.09, 32.91)

6 0
3 years ago
3b – 7 &lt; 32 I don't know the answer help !!
Nuetrik [128]
If your solving for B then its B<43/3
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