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mestny [16]
3 years ago
6

If a coin has been altered so that the probability of heads coming up is 3/10, then the probability of tails coming up is also 3

/10 .
true or false
Mathematics
2 answers:
Vadim26 [7]3 years ago
6 0
False. Since the probability of one side of the coin is 3/10, the other must be 7/10.
sammy [17]3 years ago
3 0
False. It would be 7/10. I’m pretty sure...
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The length of a parallelogram exceeds its breadth by 30 cm. If the perimeter of the parallelogram is 2 m 60 cm, find the length
Nuetrik [128]

\huge\underline{\underline{\boxed{\mathbb {SOLUTION:}}}}

\longrightarrow \sf{2(1 + b) = 260}

\longrightarrow \sf{2(x+30+x) = 260}

\longrightarrow \sf{ 2x+30 = \dfrac{260}{20} }

\longrightarrow \sf{2x + 30 =130}

\longrightarrow \sf{2x = 130 - 30}

\longrightarrow \sf{2x = 100}

\longrightarrow \sf{x=  \dfrac{100}{2} }

• \longrightarrow \sf{b= \underline{50cm}}

\longrightarrow \sf{= x + 30}

\longrightarrow \sf{= 50 + 30}

• \longrightarrow \sf{ \underline{80cm}}

\huge\underline{\underline{\boxed{\mathbb {ANSWER:}}}}

\large\bm{Breadth= \: 50cm}

\large\bm{Length= \: 80cm}

3 0
1 year ago
g A random sample of 100 students was taken. Eighty-five of the student in the sample experienced anxiety during the exam. We ar
BaLLatris [955]

Answer:

The test statistic is z = 1.25

Step-by-step explanation:

We are interested in determining whether or not the proportion of the student who experience anxiety during the exam is significantly more than 80%.

At the null hypothesis, we test if the proportion is 80%, that is:

H_0: p = 0.8

At the alternate hypothesis, we test if the proportion is more than 80%, that is:

H_a: p > 0.8

The test statistic is:

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

In which X is the sample mean, \mu is the value tested at the null hypothesis, \sigma is the standard deviation and n is the size of the sample.

80% is tested at the null hypothesis:

This means that \mu = 0.8, \sigma = \sqrt{0.2*0.8} = 0.4

A random sample of 100 students was taken. Eighty-five of the student in the sample experienced anxiety during the exam.

This means that n = 100, X = \frac{85}{100} = 0.85

The test statistic is

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

z = \frac{0.85 - 0.8}{\frac{0.4}{\sqrt{10}}}

z = 1.25

The test statistic is z = 1.25

4 0
3 years ago
What is the final amount if 286 is increased by 7% followed by a further 9% increase?
sladkih [1.3K]

Answer:

333.56

Step-by-step explanation:

286×1.07=306.02

306.02×1.09=333.56

4 0
3 years ago
The length of the two sides of the right triangle ABC are given.Find the length of the missing side.See example 1
vitfil [10]
The answer is 10. Hope this helps.
5 0
3 years ago
Read 2 more answers
Can someone please help me i don’t understand it
forsale [732]

Answer:

d= bv + r

Treat it like you would a normal equation. Multiply by b and add r to isolate d.

5 0
3 years ago
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