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kykrilka [37]
3 years ago
12

The Briarwood Middle School chess club has 55 members. 22 of the members are in seventh grade. What percent of the members of th

e chess club are in seventh grade?
Mathematics
2 answers:
Jet001 [13]3 years ago
8 0

Answer:

40%

Step-by-step explanation:

22/55 = ?/100

Novosadov [1.4K]3 years ago
7 0

Answer:

Step-by-step explanation: you take 22 over 55 times x over 100 you should get 55x=2200 then divide 2200 by 55 and you should get your answer of 40 percent

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What’s the value of x? :/
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Answer:

x = 27

Step-by-step explanation:

According to congruent chords and arcs theorem, if \overline{XY} \cong \overline{ZY} then \arc{XY} \cong \arc{ZY}.

This means that \arc{XY} = \arc{ZY} = (6x - 20) degrees

Thus:

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3 years ago
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The brain volumes ​(cm cubed​) of 20 brains have a mean of 1111.2 cm cubed and a standard deviation of 125.3 cm cubed. Use the g
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Answer:

Yes, the value 1411.8 cm³ is significantly high.

Step-by-step explanation:

Consider the provided information.

The brain volumes ​(cm cubed​) of 20 brains have a mean of 1111.2 cm cubed and a standard deviation of 125.3 cm cubed.

The range rule of thumb to identify the limits separating values that are significantly low or significantly high is:

The range rule of thumb identifying significant values are as.

Significantly low values are μ-2σ

Substitute the μ = 1111.2 and σ = 125.3 in above formula.

1111.2-2(125.3)=860.6

Significantly high values are μ+2σ

Substitute the μ = 1111.2 and σ = 125.3 in above formula.

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Hence, Yes, the value 1411.8 cm³ is significantly high.

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