Using the Empirical Rule, it is found that the interval in which approximately 978 students scored was:
A. 72 < x < 88.5.
<h3>What does the Empirical Rule state?</h3>
It states that, for a normally distributed random variable:
- Approximately 68% of the measures are within 1 standard deviation of the mean.
- Approximately 95% of the measures are within 2 standard deviations of the mean.
- Approximately 99.7% of the measures are within 3 standard deviations of the mean.
The percentage that 978 is of 1200 is:
978/1200 x 100% = 81.5%.
Considering the symmetry of the normal distribution, two outcomes are possible involving 81.5% of the measures:
- Between one standard deviation below the mean and two above, which in the context of this problem is between 77.5 and 94.
- Between two standard deviations below the mean and one above, which in the context of this problem is between 72 and 88.5, which is option A in this problem.
More can be learned about the Empirical Rule at brainly.com/question/24537145
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Answer:
B.distance = speed × 90
Step-by-step explanation:
We know that distance = rate * time
We know the time is 90 minutes
distance = speed * 90
Answer:
10t - 25
Step-by-step explanation:
multiply each term in the parenthesis by the 5 outside
= (5 × 2t) + (5 × - 5) = 10t + (- 25) = 10t - 25
Answer:
I believe the answer is C=1.25g
Step-by-step explanation:
Hope this helps!
