The mean shoe size of the students in a math class is 7.5. most of the shoe sizes fall within 1 standard deviation, or between a size 6 and a size 9.

what is the standard deviation of the shoe size data for the math class?
a.1.5
b.2.7
c.3.0
d.3.8

Anyone know? will mark brainliest if correct

Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.

Given the following linear function sketch the graph of the function and find the domain and range. ƒ(x) = -5x + 4