Question
Asked Mar 8, 2019
1 views

Find the proportion of scores greater than 70 mean is 90 standard deviation is 10

 

check_circle

Expert Answer

Step 1

The standard normal distribution:

A continuous random variable Z is said to follow standard normal distribution if the probability density function of Z is,

fullscreen
Step 2

Z-score:

The Z-score measures a particular value’s relationship to the mean in a group of values. It gives the number of standard deviation from the mean for the particular data point.

The general formula to obtain Z-score is,

Z = (x – population mean) / population standard deviation.

Step 3

Here, the score, say X, has mean 90 and standard deviation 10. Thus, the p...

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.

Related Statistics Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: Is the magnitude of an earthquake related to the depth below the surface at which the quake occurs? ...

A: Part (a):The scatter diagram, along with the best fitted line (least-squares regression line) for th...

question_answer

Q: A researcher claims that the incidence of a certain type of cancer is less than 5%. To test this cla...

A: Test statistic calculation:In this context, a researcher claimed that the proportion of incidence of...

question_answer

Q: How would I construct a stem and leaf plot using these numbers 57 54 52 55 51 56 61 68 56 55 54 61 5...

A: Introduction:The numbers here are all two-digit numbers. So, you can consider the digit in the ten’s...

question_answer

Q: Let x be the age of a licensed driver in years. Let y be the percentage of all fatal accidents (for ...

A: Hey, since there are multiple subpart questions posted, we will answer first three subparts. If you ...

question_answer

Q: The body temperatures of a group of healthy adults have a bell-shaped distribution with a mean of 98...

A: According to the empirical rule, in the standard normal curve, approximately 68% of the area is with...

question_answer

Q: See the attached question.

A: Introduction to binomial distribution:Consider a random experiment involving n independent trials, s...

question_answer

Q: The claim is that the proportion of peas with yellow pods is equal to 0.25​ (or 25%). The sample sta...

A: Sample proportion:It is given that out of 420 peas, 116 of them having yellow pods.The claim states ...

question_answer

Q: Total plasma volume is important in determining the required plasma component in blood replacement t...

A: Note:Hi! Thank you for posting the question. Since your question has more than 3 parts, we have solv...

question_answer

Q: yai ayu, au uiaı uie iwu aapico aI IIupcInuc J pi IaIuvII apico ocicLICu 1VIITIVILIany uiouIvulcu pu...

A: Solution:Null and alternative hypotheses:The null and alternative hypotheses to test is given below:...