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3 years ago

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In a high school graduating class of 100 students, 54 studied mathematics, 69 studied history, and 35 studied both mathematics a

nd history. if one of these students is selected at random, find the probability that:

1 answer:

Anna11 [10]3 years ago

5 0

You need to add more information, find the probability of what?

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Mean of of 0, 3, and 6

ehidna [41]

Answer:

3

Step-by-step explanation:

Mean= add up all the numbers, then divide by how many numbers there are. 0+3+6=9

9/3=3

8 0

2 years ago

HELP HELP HELP PLEASE:)) Find the slope and y-intercept

inna [77]

Answer:

Answer choice A

Step-by-step explanation:

Use the slope intercept form y = mx + b to find the slope m and y-intercept b.

Slope = 4/3

y intercept = (0,-3)

Therefore the answer choice is A, 4/3 ; -3

Please mark brainliest if possible ;)

5 0

2 years ago

Do political science classes require less writing than history classes? The 55 randomly selected political science classes assig

tia_tia [17]

Answer:

No, political science classes does not require less writing than history classes.

Step-by-step explanation:

We are given that the 55 randomly selected political science classes assigned an average of 19.6 pages of essay writing for the course. The standard deviation for these 55 classes was 4.8 pages.

The 50 randomly selected history classes assigned an average of 20.2 pages of essay writing for the course. The standard deviation for these 50 classes was 3.3 pages.

<em>Let </em> $\mu_1$ <em> = mean writing required by political science classes</em>

<em /> $\mu_2$ <em> = mean writing required by history classes</em>

SO, Null Hypothesis, $H_0$ : $\mu_1-\mu_2\geq0$ or $\mu_1\geq \mu_2$ {means that political science classes require more or equal writing than history classes}

Alternate Hypothesis, $H_A$ : $\mu_1-\mu_2$ or $\mu_1$ {means that political science classes require less writing than history classes}

The test statistics that will be used here is <u>Two-sample t test statistics</u> as we don't know about the population standard deviations;

T.S. = $\frac{(\bar X_1-\bar X_2)-(\mu_1-\mu_2)}{s_p\sqrt{\frac{1}{n_1}+\frac{1}{n_2} } }$ ~ $t__n__1+_n__2-2$

where, $\bar X_1$ = sample average writing for political science course= 19.6 pages

$\bar X_2$ = sample average writing for history course= 20.2 pages

$s_1$ = sample standard deviation for political science classes = 4.8 pages

$s_2$ = sample standard deviation for history classes = 3.3 pages

$n_1$ = sample of selected political science classes = 55

$n_2$ = sample of selected history classes = 50

Also, $s_p=\sqrt{\frac{(n_1-1)s_1^{2}+(n_2-1)s_2^{2} }{n_1+n_2-2} }$ = $\sqrt{\frac{(55-1)\times 4.8^{2}+(50-1)\times 3.3^{2} }{55+50-2} }$ = 4.154

So, <u><em>the test statistics</em></u> = $\frac{(19.6-20.2)-(0)}{4.154 \times \sqrt{\frac{1}{55}+\frac{1}{50} } }$ ~ $t_1_0_3$

= -0.739

<em>Now at 0.01 significance level, the t table gives critical value of -2.367 at 103 degree of freedom for left-tailed test. Since our test statistics is more than the critical value of t as -0.739 > -2.367, so we have insufficient evidence to reject our null hypothesis as it will not fall in the rejection region due to which we fail to reject our null hypothesis.</em>

Therefore, we conclude that political science classes require more or equal writing than history classes.

8 0

3 years ago

type of advance medical directive does the AMA recommend? a) Euthanasia b) Living will c) Durable power of attorney O d) Undue-b

Marizza181 [45]

Answer:

A durable power of attorney. A Power of Attorney is a legal document that appoints an “Agent” to represent you and handle specific issues for you. Depending upon the terms of the Power of Attorney, your Agent could be authorized to make financial and health care decisions on your behalf. Hope this helps.

Step-by-step explanation:

3 0

2 years ago

Pleas I need help ASAP

Travka [436]

NOTE: sorry if im wrong

ANSWER: C.

5 0

2 years ago

Read 2 more answers