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muminat
3 years ago
15

Can u plz help me I don’t really get it plz show your work

Mathematics
1 answer:
rosijanka [135]3 years ago
8 0

Answer:

2.2r

Step-by-step explanation:

3.7-1.5=2.2

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Four times the sum of three consecutive integers is 180 what are the integers
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45 x 4 = 180 so the answer is 45
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a brand new candlestick has a length of one foot the candlestick is lit and left to burn at a rate of 1/2 inch per hour
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24 hours

Step-by-step explanation:

One foot is 12 inches. 12÷1/2=24 so it will take 24 hours for the candle to burn down.

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Two angles are complementary. The measure of the larger angle is 10 more than 4 times the measure of the smaller angle. Find the
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Answer:

16 = small

74 = big

Step-by-step explanation:

4x+10 = big angle

x = small angle

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3 years ago
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The top-selling Red and Voss tire is rated 50,000 miles, which means nothing. In fact, the distance the tires can run until they
Anvisha [2.4K]

Answer: 0.9726

Step-by-step explanation:

Let x be the random variable that represents the distance the tires can run until they wear out.

Given : The top-selling Red and Voss tire is rated 50,000 miles, which means nothing. In fact, the distance the tires can run until they wear out is a normally distributed random variable with a \mu=67,000 miles and a \sigma= 5,200 miles.

Then , the probability that a tire wears out before 60,000 miles :

P(x  [using p-value table for z]

Hence, the probability that a tire wears out before 60,000 miles= 0.9726

8 0
3 years ago
To help consumers assess the risks they are taking, the Food and Drug Administration (FDA) publishes the amount of nicotine foun
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Answer:

We conclude that  the mean nicotine content is less than 31.7 milligrams for this brand of cigarette.

Step-by-step explanation:

We are given the following in the question:  

Population mean, μ = 31.7 milligrams

Sample mean, \bar{x} = 28.5 milligrams

Sample size, n = 9

Alpha, α = 0.05

Sample standard deviation, s =  2.8 milligrams

First, we design the null and the alternate hypothesis

H_{0}: \mu = 31.7\text{ milligrams}\\H_A: \mu < 31.7\text{ milligrams}

We use One-tailed t test to perform this hypothesis.

Formula:

t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }

Putting all the values, we have

t_{stat} = \displaystyle\frac{28.5 - 31.7}{\frac{2.8}{\sqrt{9}} } = -3.429

Now, t_{critical} \text{ at 0.05 level of significance, 8 degree of freedom } = -1.860

Since,                  

t_{stat} < t_{critical}

We fail to accept the null hypothesis and accept the alternate hypothesis. We conclude that  the mean nicotine content is less than 31.7 milligrams for this brand of cigarette.

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3 years ago
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