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3 years ago

A teacher asked the class to write an expression that Which of these expressions have an estimated

Mathematics

2 answers:

valkas [14]3 years ago

6 0

Answer:

9.7 x 2.84 and 6.25 x 4.76

Step-by-step explanation:

they are the only two that get close to 30 without getting over it

max2010maxim [7]3 years ago

3 0

Answer:

9.7 x 2.84 and 6.25 x 4.76

Step-by-step explanation:

they are the only two that get close to 30 without getting over it

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A study sampled 350 upperclassmen (Group 1) and 250 underclassmen (Group 2) at high schools around the city of Portland. The stu

iVinArrow [24]

Answer:

$-0.061 < P_1 -P_2< 0.025$

Step-by-step explanation:

Give data:

$n_1 = 350$

$n_2 =250$

$x_1 = 23$

$x_2 = 21$

$\hat{P} 1 = \frac{x_1}{n_1} = \frac{23}{350} = 0.066$

$\hat{P} 2 = \frac{x_2}{n_2} = \frac{21}{250} = 0.084$

for 95% confidence interval

$\alpha = 1 - 0.95 = 0.05 and \alpha/2 = 0.025$

$z_{\alpha/2} = 1.96$ from standard z- table

confidence interval for P_1 and P_2 is

$\hat{P} 1 - \hat{P} 2 \pm z_{\alpja/2} \sqrt{\frac{\hat{P} 1(1-\hat{P} 1)}{n_1} +\frac{\hat{P} 2(1-\hat{P} 2)}{n_2}}$

$(0.066 - 0.084) \pm 1.96 \sqrt{\frac{0.066(1-0.066)}{350} +\frac{0.084(1-0.084)}{250}}$

$-0.018 \pm 0.043$

confidence interval is

$-0.018 - 0.043 < P_1 -P_2$

$-0.061 < P_1 -P_2< 0.025$

7 0

3 years ago

Help will mark Brainliest

Illusion [34]

Answer:

x=116°

Step-by-step explanation:

180° - 64° = 116°

4 0

3 years ago

Read 2 more answers

Alex is painting an 8 foot mural on the wall of the community center. If he has finished 1/4 of the mural, how many feet of the

slamgirl [31]

2 square feet
Hope this helps!
Vote my brainliest!

8 0

3 years ago

PLZ HELP RN ILL MARK YOU BRAINLIST IF ITS RIGHT PLZZZ IM DESPERATE

Reptile [31]

Answer:

equation:x*1/5=9/20

answer=9/4

Step-by-step explanation:

9/20÷1/5=9/20×5/1 in word form you multiply 9/20 by its reciprocal.

first you want to simplify and change 9/20 to 9/4 and change 5/1 to 1/1 and then multiply to get 9/4

5 0

3 years ago

Read 2 more answers

Isabelle's book collection contains 15 books, including 6 biographies.

Pachacha [2.7K]

Answer: The probability is 6/15 or 40%

Step-by-step explanation: In your question, you said Isabelle's book collection has 15 books and in that collect she has 6 autobiographies. So they probability as a fraction is 6/15.

8 0

2 years ago