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3 years ago

3/7 + 1/7? Answers are 1/7 3/7 4/7 5/7

Mathematics

2 answers:

spin [16.1K]3 years ago

5 0

Answer:4/7

Step-by-step explanation:3+1=4 and since both have the same number 7 it stays the same

Anna11 [10]3 years ago

4 0

Answer:

4/7

Step-by-step explanation:

if you add the 3 and the 1 it makes 4, since the denominators are the same you don't add them you keep them the same

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The waking time of a student under common conditions is normally distributed with mean of 30 hours and a standard deviation of 5

Elina [12.6K]

Answer:

If the walking time is greater than or equal to 38.225 hours, than it exceeds 95% probability that is lie in top 5%.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 30 hours

Standard Deviation, σ = 5 hours

We are given that the distribution of waking time is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

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$\displaystyle\frac{x - 30}{5} = 1.645\\\\x = 38.225$

Thus, if the walking time is greater than or equal to 38.225 hours, than it exceeds 95% probability that is lie in top 5%.

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Step-by-step explanation:

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