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maksim [4K]
3 years ago
11

solve the average time for a student to complete this quiz is 24 24 minutes with a standard deviation of 2 minutes. What is the

range of minutes needed for the middle 99.7% of the quiz timee?
Mathematics
1 answer:
LuckyWell [14K]3 years ago
3 0

Answer:

The correct answer is "(18, 30) minutes".

Step-by-step explanation:

Mean,

= 24

Standard deviation,

= 2

The range of minutes where 99.7% of individuals completed the quiz will be:

= Mean \pm 3\times Stdev

On substituting the values, we get

= 24 \pm 3\times 2

= 24 \pm 6

now,

= 24-6

= 18

Or,

= 24+6

= 30

i.e., 18 to 30 minutes

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Answer:

Step-by-step explanation:

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To estimate the number of people in Springfield, population 10,000, who have a swimming pool in their backyard, 250 people were
Andrei [34K]

Answer:

2400 people

Step-by-step explanation:

Let x be the number of people who had a swimming pool in the population of 10,000,

Thus, the ratio of people who had swimming pool to the total population = \frac{x}{10000}

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