What will be the answer if a multiple choice test consisting of 10 questions with four choices each, and the student guesses the answer to each question? What is the probability that he gets 8 questions correctly?
For each question we have 4 choices. So if you have 10 on such questions, you ll have :4*4*4*4*4*4*4*4*4*4= 4^10 = 2048Getting 8 correct means=> 8 corrects and two wrongs3/4 is the probability if a question is answered wrong1/4 is the probability if a question is answered correctlyso we can consider this probability :P=(3/4)*(3/4)*(1/4)*(1/4)*(1/4)*(1/4)*(1/4)*(1/4)*(1/4)*(1/4)=> P=0.00000858306But as we can select any combination of 2 from 10 for being wrong, so we need to multiply P by (10,2)=10!/(2!*8!) =45so the answer is P*45 = 0.00038623809So not very lucky to answer randomly!By the way, is it a question from your home work assignment? ;) ;)
How do I create or draw a flowchart to find the average of three input integer numbers?
To draw any flowchart it is necessary to make algorithm for the sameAlgorithm : To calculate average of three numbers.Step1 : Read three values a, b, c. //(int or float or double any but dont write datatype in flowchart)Step2 : initialize avg to 0Step3 : avg <- (a+b+c)/3Step4 : print avgThen to draw flowchart for same. First we need to understand what are the symbols for each statement.Now to draw flowchart of finding the average of three numbers, we use above symols and make a flowchart like thisIn this way we can draw flowchart of finding the average of three numbers. One thing which is important is here that name of variables should be in caps ie here AVG, A, B, C. Thats it.
In a test there are 80 questions. A candidate gets 1 mark for each correct answer, and a minus of .5 for each wrong answer. If the candidate scores 54.5 marks, how many correct answers did he have?
Getting one question wrong effectively costs the candidate 1.5 marks (the 1 mark he failed to earn and also the -.5 he earned for the wrong answer).54.5 marks out of 80 means that he failed to earn 25.5 marks. 25.5 / 1.5 gives the number of wrong answers.25.5/1.5 = 17→ 17 incorrect answers out of 80 questions means 63 were correct. ← answer