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3 years ago

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Mathematics

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Jet001 [13]3 years ago

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What is 6/10 plus 4/10

son4ous [18]

Answer:

Explanation:

$\frac{6}{10} + \frac{4}{10}$

By taking LCM

We get

$\frac{6 + 4}{10} = \frac{10}{10} = 1$

3 0

2 years ago

Read 2 more answers

Quarters are currently minted with weights normally distributed and having a standard deviation of 0.065. New equipment is being

Ilya [14]

Answer:

Yes, the new equipment appear to be effective in reducing the variation of weights.

Step-by-step explanation:

We are given that Quarters are currently minted with weights normally distributed and having a standard deviation of 0.065.

A simple random sample of 25 quarters is obtained from those manufactured with the new equipment, and this sample has a standard deviation of 0.047.

Let $\sigma$ = standard deviation of weights of new equipment.

SO, Null Hypothesis, $H_0$ : $\sigma \geq$ 0.065 {means that the new equipment have weights with a standard deviation more than or equal to 0.065}

Alternate Hypothesis, $H_A$ : $\sigma$ < 0.065 {means that the new equipment have weights with a standard deviation less than 0.065}

The test statistics that would be used here One-sample chi-square test statistics;

T.S. = $\frac{(n-1)s^{2} }{\sigma^{2} }$ ~ $\chi^{2}__n_-_1$

where, s = sample standard deviation = 0.047

n = sample of quarters = 25

So, the test statistics = $\frac{(25-1)\times 0.047^{2} }{0.065^{2} }$ ~ $\chi^{2}__2_4$

= 12.55

The value of chi-square test statistics is 12.55.

Now, at 0.05 significance level the chi-square table gives critical value of 13.85 at 24 degree of freedom for left-tailed test.

Since our test statistic is less than the critical value of chi-square as 12.55 < 13.85, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which we reject our null hypothesis.

Therefore, we conclude that the new equipment have weights with a standard deviation less than 0.065.

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3 years ago

Order the numbers from least to greatest. 9/5,−2.5,−1.1,−4/5, 0.8

Semenov [28]

Answer:

-4.5 , to - 2.5 , to , - 1.1 , to 0.8, to 9/5

Step-by-step explanation:

3 0

3 years ago

Brittany has a recipe which yields 25 hamburgers, but she only needs to make 10. If the original recipe calls for nine pounds of

tankabanditka [31]