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3 years ago

7th grade math help me pleaseeee

Mathematics

1 answer:

timurjin [86]3 years ago

3 0

Answer:

Step-by-step explanation:

its really simple

just use your brain

4/4 makes 1 whole and 12-11=1 we need to convert the fraction into a whole number. So what over 4 makes 11 wholes? just do 4x11=44 and 44/4=11 and 12-11=1 just do the same for the other ones

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In Major League Baseball, the American League (AL) allows a designated hitter (DH) to bat in place of the pitcher, but in the Na

IRINA_888 [86]

Answer:

Step-by-step explanation:

The objective is to compute that more runs are scored in games for which DH is used

Let $\mu_1$ denote the population mean number of runs scored for DH group

Let $\mu_2$ denote the population mean number of runs scored for DH group

Let $n_1$ and $n_2$ denote the sample sizes for DH and no DH

From the available information

$n_1=n_2=20$

The population standard deviation of runs score is 2.54 for both the groups.

That is $\sigma _1^2=\sigma_2^2=2.54$

The null hypothesis is $H_0:\mu_1\leq \mu_2$

The alternative hypothesis is $H_1:\mu_1>\mu_2$

Let the level of significance $\alpha =0.10$

Since, the population standard deviation for both the group is known , even though the sample size is less than 30 , use z test

The test statistic is

$z=\frac{\bar x_1 - \bar x_2}{\sqrt{\frac{\mu_1^2}{n_1} +\frac{\mu_2^2}{n_2} } }$

The sample mean for the DH group is computed as

$\bar x_1=\frac{1}{n_1} \sum_{i=1}^{n_1}\\\\=\frac{1}{20} (0+6+8+2+2+4+7+7+6+5+1+1+5+4+4+5+7+11+10+0)\\\\=\frac{92}{20}\\\\=4.6$

The sample mean of no DH is computed as

$\bar x_2=\frac{1}{n_2} \sum_{i=1}^{n_1}\\\\=\frac{1}{20} (3+6+2+4+0+5+7+6+1+8+12+4+6+3+4+0+5+2+1+4)\\\\=\frac{83}{20}\\\\=4.15$

The test statistic is

$z=\frac{\bar x_1 - \bar x_2}{\sqrt{\frac{\mu_1^2}{n_1} +\frac{\mu_2^2}{n_2} } }$

$=\frac{4.60-4.15}{\sqrt{\frac{2.54^2}{20} +\frac{2.54^2}{20} } } \\\\=\frac{0.45}{\sqrt{0.32258+0.32258} } \\\\=\frac{0.45}{0.803219}\\\\=0.5602$

P-Value

From the alternative hypothesis, it is clear that the test is one tailed test

P-value = P(Z > z)

$1-P(Z\leq z)\\\\1-P(Z\leq 0.5602)$

1 - normsdist (0.5602)

(using excel function "normsdist(z)")

= 1 - 0.7123

= 0.2877

Therefore, the P-Value is 0.2877

Decision Rule

Reject the null hypothesis , if the p-value is less than the level of significance . that is p-value is < 0.10

Here, the p-value is 0.2877 which is greater than the level of significance 0.10

so , fail to reject the null hypothesis and conclude that there is no sufficient evidence to support the claim that more runs scored in games for which DH is used.

6 0

3 years ago

Evaluate.<br><br><br> 90 • 4 – 14 ÷ 2 + 102 ÷ 5 • 2

MakcuM [25]

The answer is 363.2 unless there's parentheses

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3 years ago

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Simplify the following expressi

12345 [234]

Answer:

Step-by-step explanation:

if im correct its a could be wrong

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4 years ago

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steve made a mistake in writing a two step equation. Instead of multiplying by 3 and adding 7, he multiplied by 7 and added 3 to

rjkz [21]

Answer:

The correct answer of the problem is 1.

Step-by-step explanation:

Let the original number on which the wrong procedure is applied is x.

Now, Steve multiplied by 7 and then added 3 to get the answer of - 11.

So, 7x + 3 = - 11

⇒ 7x = - 14

⇒ x = - 2

Now, the correct step to get the answer is multiplying by 3 and adding 7.

Hence, the correct answer of the problem is (- 2) × 3 + 7 = - 6 + 7 = 1 (Answer)

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4 years ago

What is the converse of the following conditional statement? If x = –10, then x2 = 100

tangare [24]

The converse would be If x² = 100 then x = -10

So essentially if the conditional statement is p → q then the converse is q → p (In essence, the converse of a conditional statement is formed by interchanging the hypothesis and the conclusion.)

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4 years ago