The distribution of grades on a certain test has a mean of, Ask an Expert

Statistics

The distribution of grades on a certain test has a mean of 85.5 with a standard deviation of 11.2. There are 400 tests. Assuming that the grades are normally distributed, predict the number of students scoring between 75 and 95. Use a table of area under the curve within z standard deviations of the mean.

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91013711

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

Prior data indicates if a planter machine is operating

Prior data indicates if a planter machine is operating "properly," the length of the planter produced by the machine can be modeled as being normally distributed with a mean of 107 centimeters and a standard deviation of ...

Please show all worka pair of dice is tossed and the face

Please show all work. A pair of dice is tossed and the face number of each die is recorded. Assuming the dice are fair, what's the probability of the sum of the die faces showing is even?

Simone founded her company using 175000 of her own money

Simone founded her company using $175,000 of her own? money, issuing herself 200,000 shares of stock. An angel investor bought an additional 200,000 shares for $125,000. She now sells another450,000 shares of stock to a ...

The researchers stated that there were no significant

The researchers stated that there were no significant differences in the baseline characteristics of the intervention and control groups. Are these groups heterogeneous or homogeneous at the beginning of the study? Why i ...

1 overproduction of uric acid in the body can be an

1. Overproduction of uric acid in the body can be an indication of cell breakdown. This may be an advance indication of illness such as gout, leukemia, or lymphoma.† Over a period of months, an adult male patient has tak ...

A doctor wants to predict the birth weight of a newborn

A doctor wants to predict the birth weight of a newborn baby (measured in grams) based on the gestational age (measured in weeks) at the time of birth. The doctor uses 11 data points, with births ranging from 29 weeks to ...

1nbspfind the probability that among 16 randomly selected

1) Find the probability that among 16 randomly selected people; at least 4 believe that college is no longer a good investment. P ( x > or = 4), n=16, p=0.1 2) Find the probability that among 16 randomly selected people; ...

Confidence intervals ci are one of the simpler forms of

Confidence intervals (CI) are one of the simpler forms of inferential statistics. What does the CI represent? And why does our knowledge of the Central Limit Theorem (CLT) and the empirical rule let us understand why the ...

In a population of phd students 50 have paid assistant

In a population of Ph.D students 50% have paid assistant ships. A random sample of n=200 students are chosen. What is the expected number of students who have paid assistant ships in this sample?

There are 5 women and 8 men in a department how many ways

There are 5 women and 8 men in a department. How many ways can a committee be selected if there must be 2 men and 2 women on the committee? Number of ways to select a committee containing 2 men and 2 women is

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Statistics and Probability Expert