How many length-6 strings over σ = {0, 1, 2} have exactly two 2’s?

Two lines parallel to the same plane are parallel to eachother

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

98 point question what is the record for most points in one