a data set has a mean of 45 and a standard diviation of 5. what is the data value that is 2 standard deviations above the mean​

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

Prove that quadrilateral is a rhombus.