3 years ago

1x 4/7x2/5 helllllllllllllllllllllllllllllllllllllllp meeeeeeeeeeeeeeeeeeeeee

Mathematics

2 answers:

solong [7]3 years ago

6 0

Answer: It’ll be 8/35

Alecsey [184]3 years ago

5 0

Answer:

8/35

Step-by-step explanation:

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The principal randomly selected six students to take an aptitude test. Their scores were: 81.6 72.0 81.1 86.4 70.2 83.1 Determin

tatyana61 [14]

Answer:

84.38, 73.74

Step-by-step explanation:

score given 81.6, 72.0, 81.1, 86.4, 70.2, 83.1

sample size (n) = 6

$mean = \dfrac{81.6+ 72.0+ 81.1+ 86.4+ 70.2+ 83.1}{6}$

mean = 79.06

standard deviation

$\sigma =\sqrt{\frac{\sum (x-\bar{x})^2}{n-1}}$

$\sigma =\sqrt{\frac{ (81.6-79.06)^2+(72-79.06)^2+(86.4-79.06)^2+(70.2-79.06)^2+(81.1-79.06)^2+(83.1-79.06)^2}{6-1}}$

σ = 6.47

level of significance (α) = 1 - 90% = 10%

confidence interval

$\bar{x} \pm t_{\alpha}(\frac{S}{\sqrt{n}})\\79.06 \pm 2.015(\frac{6.47}{\sqrt{6} })$

=79.06 ± 5.32

= 84.38, 73.74

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4 years ago

Leslie worked for 180 minutes. How many hours did she work

Sever21 [200]

Answer:

3 hours

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Which is the following is a possible solution for the inequality? x+7<10

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$x + 7 < 10 \\ x < 10 - 7 \\ x < 3$

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3 years ago

What is an acute angle?

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An obtuse angle is more than 90°.

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