The scores of 5 students in an examination are 6,5,8,7 and 4.find the variance and standard deviation

1. are the triangles similar and if so why? what is the value of x? show your work.

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

Suppose sat writing scores are normally distributed with a mean of 497 and a standard deviation of 109. a university plans to award scholarships to students whose scores are in the top 2%. what is the minimum score required for the scholarship? round your answer to the nearest whole number, if necessary.