posted by .

A set of 750 values has a normal distribution with a mean of 12.5 and a standard deviation of 0.36.

A. What percent of the data is between 12.25 and 12.75?

B. Find the interval about the mean within wich 45% of the data lie.

C. Find the probability of that a value selected at random from this data is between 11.67 and 13.33.

Are these correct?

Yes, they are correct.
I find minor differences in the last digits, probably due to round-off or interpolation errors.

## Similar Questions

1. ### Math (Statistic)

Considered the sampling distribution of a sample mean obtained by random sampling from an infinite population. This population has a distribution that is highly skewed toward the larger values. a) How is the mean of the sampling distribution …
2. ### statistics

I.use the chebyshev's theorem to find out what percentage of the values will fall between 201 and 257 for a data set with a mean of 229 and standard deviation of 14. II. use the emperical rule to find out two values 68% of the data …
3. ### MATH

Which of the following normal distributions has the smallest spread?
4. ### Math-Statistics

I. Use Chebyshev’s theorem to find what percent of the values will fall between 156 and 276 for a data set with a mean of 216 and standard deviation of 12. II. Use the Empirical Rule to find what two values 68% of the data will fall …
5. ### Math

I. Use Chebyshev’s theorem to find what percent of the values will fall between 156 and 276 for a data set with a mean of 216 and standard deviation of 12. II. Use the Empirical Rule to find what two values 68% of the data will fall …
6. ### Stats

I. Use Chebyshev’s theorem to find what percent of the values will fall between 183 and 227 for a data set with a mean of 205 and standard deviation of 11. II. Use the Empirical Rule to find what two values 99.7% of the data will …
7. ### Math-confused...plz help

I. Use Chebyshev’s theorem to find what percent of the values will fall between 183 and 227 for a data set with a mean of 205 and standard deviation of 11. II. Use the Empirical Rule to find what two values 99.7% of the data will …
8. ### Pre calc

A set of 500 values has a normal distribution. The mean of the data is 24 and the standard deviation is 2. Find the range about the mean which includes 50% of the data.
9. ### math

Using the data in the table, calculate the mean, range, variance, and standard deviation, and then answer questions e and f. Round the variance and standard deviation to one decimal place. a. Mean b. Range c. Variance d. Standard deviation …
10. ### Algebra (Normal Distribution)

The mean of a normally distributed data set is 12, and the standard deviation is 2. ___% of the data points lies between 8 and 16. Find the percentage

More Similar Questions