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3 years ago

90 students take a test.

Mathematics

1 answer:

Anika [276]3 years ago

5 0

Answer:

Step-by-step explanation:

If there are 90 students and the ratio of boys to girls is 3:2, that means 3x+2x=90

Combine like terms: 5x=90

x=18

2x (girls)=36

3x (boys)=54

1/3 of the boys scored full marks, so 54/3=18 boys scored full marks

The number of girls who scored full marks is half of the number who did not score full marks means that 1/3 of the girls scored full marks. 36/3=12, so 12 girls scored full marks.

(I don't know what the question is sorry if it's incorrect but there's not enough information)

Hope this helps!

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gregori [183]

Answer:

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3 years ago

At last week's track meet, Stacy ran 9/12 of a km, Jules ran 4/5 of a km, and Raul ran 3/4 of a mile. Which two students ran the

koban [17]

Answer: No two students ran same distance

Step-by-step explanation:

Given

Stacy ran $\frac{9}{12}$ of a km i.e.

$\Rightarrow 1\times \dfrac{9}{12}=\dfrac{3}{4}=0.75\ km$

Jules ran $\frac{4}{5}$ of a km i.e.

$\Rightarrow 1\times \dfrac{4}{5}=0.8\ km$

Raul ran $\frac{3}{4}$ of mile i.e.

$\Rightarrow 1\times \dfrac{3}{4}=0.75\ miles\\\\\text{1 mile=1.6 km}\\\\\Rightarrow 0.75\ miles=1.2\ km$

So, no two students ran the same distance.

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3 years ago

How long will it take for a falling object to reach 108 m/s if its initial velocity is 10 m/s?

defon

Answer:

t=10 s

Step-by-step explanation:

v=u+gt

108=10+9.8t

108-10=9.8t

9.8t=98

$t=\frac{98}{9.8} =\frac{980}{98} =10$

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1 year ago

Based on the random sample of n=800 observations, we have obtained a sample proportion p(bar =0.44. the goal is to test: h(0: p?

uysha [10]

<span>The standard error of a distribution of sample proprtions is defined as the standard deviation of the distribution and is symbolized by
$SE(\hat{p})$
and is calculated by the formula
$SE(\hat{p})= \sqrt{ \frac{p(1-p)}{n} }$ </span>.

Given a <span>random sample of n = 800 observations and a sample proportion p = 0.44.

To test:
$H_0:\hat{p}\ \textgreater \ 0.48 \\ H_a:\hat{p}\ \textless \ 0.48$

The standard error rounded to four decimal places is given by:
$SE(\hat{p})= \sqrt{ \frac{0.44(1-0.44)}{800} } \\ \\ = \sqrt{ \frac{0.44(0.56)}{800} } = \sqrt{ \frac{0.2464}{800} } \\ \\ = \sqrt{0.000308} =\bold{0.0175}$ </span>

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3 years ago

I'm thinking of a number. When you triple my number and subtract 8 you get 7. What is my number?

CaHeK987 [17]

So here, just work backwards:

7+8=15
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7 0

3 years ago

Read 2 more answers