Patrick flipped 2 coins 100 times and got only 2 heads up 19 times, he got 2 tails up 31 times and one heads up and one tails up 50 times. What is the theoretical and experimental possibility of the coins showing 2 heads?

Which of the following statement about pascal's triangle are true?

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

When y’all answer can y’all explain too !