In June, an investor purchased 300 shares of Oracle (an information technology company) stock at $53 per share. In August, she purchased an additional 400 shares at $42 per share. In November, she purchased an additional 400 shares at $45. What is the weighted mean price per share? (Round your answer to 2 decimal places.) Weighted mean price per share

d. equals the national mean of $55.4 thousand.e. exceeds the national mean of $55.4 thousand.

Joselyn hopes to receive a grade of B or better in her statistics class. Currently she has scored 75, 83, and 81 on her three in-class tests and also has a homework average of 88. Her professor calculates the class grade by finding the mean of five grades: three in-class tests, the homework average and the final exam. What is the minimum score Joselyn must earn on the final exam to have a class grade (mean) of 80? A. 67 B. 95 C. 70 D. 73

A typical high-income household in 1980 earned $125,527. A similar household in 2009 earned $158,836. What was the relative increase in income for these households from 1980 to 2009? Round to the nearest one percent.

A mathematics professor lost a test paper belonging to one of her students. She remembered that the mean score for the class of 20 was 81 and that the sum of the 19 other scores was 1530. What was the grade on the paper she lost?

Here are some of the Final Exam scores from last semester's class: 81, 77, 90, 93, 99, 88, 85, 70, 79, 91, 94, 87. Find the mean. Round your answer to 3 decimal places.

The median annual income for someone who has an Associates Degree is $31,936. The median annual income for someone with a high school degree is $26,123. Based on the median income, how much more would someone with an associate's degree earn than someone with a high school degree over 40 years?

The weight of a package mailed during the holidays follows a uniform distribution and ranges from 2 pounds to 9 pounds.  85% of the time, the package will be greater than what value?   Round to 2 decimals.

A parent comes to you and asks the difference between percent correct and the national percentile rank on an achievement test. What do you tell the parent?

If 99 people had a mean income of $12,500, how much is the mean income increased by the addition of a single income of $240,000? The mean income increases by $