Please help me with these math problems! I have had so much going on lately and haven't had time to do them Will give lots of points and make brainliest please help

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

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom

What is 1.5% of 120 or what number is 1.5% of 120