X is the number оf times required tо pаss а pаrticularly hard state bоard exam. Historical data show that p(x) = cx for x = 1, 2, 3, 4 This copywritten question is part of a quiz or exam at Arizona State University. It may not be reproduced or posted without the permission of Dr. Linda Chattin The value of c that makes p(x) a valid probability mass function is _____. Express your answer to two decimal places. You must do this problem using one of these online calculators: ti84calc.com ti84calculator.io You will not receive any credit for this question if you do not use the online calculator, even if you get it right.