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3 years ago

3/7 0f what number is 9?

Mathematics

2 answers:

jeka57 [31]3 years ago

6 0

3/7 x = 9
3x = 63
x = 21
The answer is 21 :)

marin [14]3 years ago

4 0

<em>3/7*x=9
x=9*7/3
x=3*7{as 3 cancels 9 3 times..}
x=21
therefore number is 21..

Hope this helps u!!</em>

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2 years ago

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Which expression is equivalent 1/3x(9y-12)

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Answer:

$3y - 4$

Step-by-step explanation:

<u>Step 1: Distribute</u>

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$3y - 4$

Answer: $3y - 4$

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3 years ago

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A set of 200 test scores are normally distributed with a mean of 70 and a standard deviation of 5. Approximately how many studen

spin [16.1K]

Answer: About 191 students scored between a 60 and an 80.

Step-by-step explanation:

Given : A set of 200 test scores are normally distributed with a mean of 70 and a standard deviation of 5.

i.e. $\mu=70$ and $\sigma=5$

let x be the random variable that denotes the test scores.

Then, the probability that the students scored between a 60 and an 80 :

$P(60$

The number of students scored between a 60 and an 80 = 0.9544 x 200

= 190.88 ≈ 191

Hence , about 191 students scored between a 60 and an 80.

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4 years ago