Question
is a normally distributed random variable with mean 58 and standard deviation 2 .
What is the probability that
is greater than 60 ?
Use the
rule and write your answer as a decimal. Round to the nearest
thousandth if necessary.
What is the probability that
Use the
thousandth if necessary.
Ask by Byrd Bowen. in the United States
Jan 24,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
The probability that
is greater than 60 is 0.160.
Solution
To determine the probability that
is greater than 60, where
is normally distributed with a mean (
) of 58 and a standard deviation (
) of 2, we can use the 68-95-99.7 rule (also known as the empirical rule).
-
Identify the Z-score:So, 60 is 1 standard deviation above the mean.
-
Apply the 68-95-99.7 Rule:
- 68% of the data falls within ±1 standard deviation from the mean.
- Therefore, the probability that
is less than or equal to 60 is roughly 68% / 2 = 34% above the mean. - The total area under the curve is 100%, so the probability that
is greater than 60 is:
-
Convert to Decimal:
Final Answer:
The probability that is greater than 60 is 0.160.
The probability that
Answered by UpStudy AI and reviewed by a Professional Tutor
Like
error msg


Mind Expander
To find the probability that
is greater than 60 using the
rule, we first calculate how many standard deviations away 60 is from the mean. The mean is 58, and the standard deviation is 2, so:
According to the rule, about 68% of the data lies within one standard deviation of the mean (between 56 and 60). Thus, the probability of
being less than 60 is 0.5 (50% of the area under the curve to the left of the mean) plus half of the 68%, which gives us:
To find the probability that
is greater than 60, we subtract this from 1:
So, the probability that
is greater than 60 is
.