A large group of students took a test in Physics and the final grades have a mean of 70 and a standard deviation of 10. If we ca
n approximate the distribution of these grades by a normal distribution, between what two scores of the test in the middle 95%?
1 answer:
Answer:
The scores are between 50 and 90
Step-by-step explanation:
When we say middle 95%, we means that this value falls between 2 standard deviations of the mean i.e
μ ± 2σ
Hence,
mean of 70 and a standard deviation of 10
μ ± 2σ
μ - 2σ
70 - (2 × 10)
= 70 - 20
= 50
μ + 2σ
= 70 + (2 × 10)
= 70 + 20
= 90
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Hope this helps :)
I AM HERE TO HELP >:D
The answer is probs 2 because i estimated it and it looks like it would
