160 Answered Questions for the topic Standard Deviation
We have a mean of 126 and standard deviation of 18. Use the 68-95-99.7 rule to determine the percent of scores in the data set expected to be between the scores 72 and 144. Give your answer in decimal
When Finding standard Deviation do you use numbers in the data set that are zero?
I am doing a data report on a survey done on the number of hours students work per month. Some students do not work so their number was 0. I am finding the standard deviation for the data set and I... more
A random sample of 36 drivers used on average 749 gallons of gasoline per year. If the standard deviation of the population is 332, find the 95% confidence interval of the mean for all drivers.
500 with a standard deviation of 150, on which exam did Carlita perform better?
Carlita scored a 32 on her math ACT and a 730 on her math SAT examinations. Given that the average math ACT score is 18 with a standard deviation of 6 and the math SAT score has an average score of... more
What were the original eight measurements collected using the mean and deviations?
Students collected eight length measurements for a mathematics lab. The mean measurements was 46.3 cm. and the deviations of seven individual measurements were 0.8 cm, -0.4 cm, 1.6 cm, -1.2 cm,... more
If the common salary is 37,000 with a standard deviation of 4,000 would asalary of 32,500 be reasonabler
What is the variance and standard deviation of 77,96,87,81,62,90 and 84?
What is the variance and standar deviation?
Standard deviation and z-scores
Assume that the salaries of elementary teachers in the United States are approximately normally distributed with a mean of $32,000 and a standard deviation of $6,000. What is the approximate... more
Homework Help really struggling
Question 6 Which of the following is NOT TRUE concerning the graphic depiction ("the curve") of a distribution for means?Question options: A) The curve is skewed to the right. B) The area under... more
Standard Deviation Algebra 2
Help me with this problem please
The average adult Indian Rhino weighs 4600 pounds with a standard deviation of 500 pounds. a) What percent of Indian Rhinos are more than 4000 pounds? b) Rhinos in the 80th percentile are called... more
whats the standard deviation of the data set below, Rounding your answer to three decimal places?2, 4, 6, 6, 8, 10, 11, 12, 14, 16, 17, 18, 18, 18
How do I determine the whole number of standard deviations that includes all data values?
The mean length of Beethoven’s nine symphonies is 37 minutes; the standard deviation is 12 minutes. The datavalues are the following minutes: 23, 30, 47, 35, 30, 40, 35, 22, and 65. Determine the... more
To find the Mean and Standard Deviation
Total amount of time (x, in minutes) spent commuting by the entire 240 residents of a housing area was recorded. Given that total x = 10,980 and total ( x - µ )² = 23,191. Compute the mean and... more
About how many members are expected to be between 15 years old and 31 years old?
The ages of members of an online gaming group are normally distributed with a mean of 23 years and a standard deviation of 4 years.There are 300 members in the group.
What is the age of a movie attendee with a z-score of −1.2 ?
The ages of people in a movie theater are normally distributed with a mean of 32 years and a standard deviation of 6.2 years. (round to nearest tenth)
What is the z-score of 105? (round to nearest hundredth
A normal distribution has a mean of 102 and a standard deviation of 2.9.
If IQ scores have a mean of 100 and a standard deviation of 16 points, what IQ score do you need to be considered a genius
People with z-scores above 2.5 on an IQ test are sometimes classified as geniuses.
How would I meet the requirements for the "shape, center, and spread of distributions" with the collected information (in description)?
A part of my statistics project says to do "shape, center, and spread of distributions" with the information I collected from an experiment. I think that has to do with the bell curve and standard... more
Standard Deviation Statistics Question
The weight of a sperm whale’s brain is normally distributed with a mean of 15.5 pounds and a standard deviation of 3.6 pounds.
The weight of a sperm whale’s brain is normally distributed with a mean of 15.5 pounds and a standard deviation of 3.6 pounds. What is the probability a randomly selected sperm whale will have a... more
Standard Deviation Dispersion
Show that for any 2 numbers a and b, standard deviation is given by |a-b|÷2
The variance is taken to solve it and to show the s2= |a+b| 2 I don't know why
Is it possible for the standard deviation of a set of data to be zero? Explain.
500 units with 20 units checked for speed what is the standard deviaition
I'm not much on higher math but would I use "n" or "N-1"
please helpstandard deviation
The mean lifetime of a certain tire is 30,000 miles and the standard deviation is 2500 miles. If we assume nothing about the shape of the distribution, approximately what percentage of all such... more
Math homework help
The distribution of the weights of 100 students has a mean of 168lbs with a standard deviation of 16lbs. Predict the number of students who have weights between 135 and 175 pounds.
how many students scored within one standard deviation of the mean?, please show working.
mean 6.3 standard deviation 1.49 students scores: 4,5,5,6,6,6,7,7,8,9