1) The following histogram shows the distribution of the amount of money spent on a haircut...
The distribution of the amount of money spent by students on textbooks in a semester is approximately normal in shape with a mean of: μ= 480 and a standard deviation of: σ= 39. According to the standard deviation rule, almost 0.15% of the students spent more than what amount of money on textbooks in a semester?
The distribution of the amount of money spent by students on textbooks in a semester is approximately normal in shape with a mean of: μ = 487 and a standard deviation of: σ = 30. According to the standard deviation rule, almost 0.15% of the students spent more than what amount of money on textbooks in a semester?
The distribution of the amount of money spent by students on textbooks in a semester is approximately normal in shape with a mean of 452 and a standard deviation of 35. According to the standard deviation rule, approximately 68% of the students spent between $ and $ on textbooks in a semester.
The distribution of the amount of money spent by students on textbooks in a semester is approximately normal in shape with a mean of 391 and a standard deviation of 29. According to the standard deviation rule, approximately 95% of the students spent between $ and $ on textbooks in a semester.
6. (8 points) One histogram shows the distribution of ages of 300 pennies. The other two graphs show distributions of means from random samples taken from the same population of pennies. One histogram shows means based on samples of 5 pennies, and another shows means based on samples of 100 pennies. Each graph with means was done with many repetitions. Which distribution is which, and how do you know? Aeuency 20 IS AGE AGE C F.equency Population: Sample size 5:...
A researcher wished to compare the average amount of time spent in extracurricular activities by high school students in a suburban school district with that in a school district of a large city. The researcher obtained a simple random sample of 60 high school students in a large suburban school district and found the mean time spent in extracurricular activities per week to be 6 hours with a standard deviation of 3 hours. The researcher also obtained an independent simple...
4. The following frequency table shows the test score distribution for a random sample of 25 students taking an introductory statistics class at a certain college. a. Find the missing relative frequency b. How many students in the sample RelativeF 0.08 0.04 Score 30-40 41-51 52-62 63-73 74 -84 85-95 had a score of at least 63? Total number of students taking an introductory statistics class at this college is 800. Based on the sample data above, estimate the total...
the histogram shows the distribution of stops for red traffic lights a commuter must pass through on her work use the histogram to find the mean variance and standard deviation and expected value of the probability distribution
Answer 10-13 first please Countdown: Days-2 1ime:-10:17:03 Question 11 The distribution of IQ (Intelligence Quotient) is approximately normal inType numbers in the boxes. shape with a mean of 100 and a standard deviation of 12. o points According to the standard deviation rule, % of people have an IQ between 76 and 124. Do not round. Question 12 Type numbers in the boxes. The distribution of IQ (Intelligence Quotient) is approximately normal in shape with a mean of 100 and...
Case 1 The amount of money spent by Safeway customers is normally distributed with mean 140 and a standard deviation of 12. Suppose that a sample of 64 customers are selected. Answer the following questions. What is the mean of the sampling distribution? 140 150 170 240 What is the standard error of the sampling distribution? 1.23 1.50 1.55 1.20 What is the probability that the average spending by the customers is greater than 144? 0.9962 0.9966 0.0038 0.0048 What...