does chewing gum during a math test improve test scores

1. Three boys and three girls are to be seated around a table in a circle. Among them, the boy X does not want any girl as neighbour and girl Y does not want any boy as neighbour. How many such arrangements are possibl..

Question: A boy has 3 library tickets and 8 books of his interest in the library. Of these 8, he does not want to borrow Chemistry Part II, unless Part I is also borrowed. In how many ways can he choose the three books to be borrowed? Answer: There are two ways of selecting 3 ..

>A system of linear equations is said to be consistent if it has at least are solution, otherwise it is inconsistent. Let A be asquare matrix of order n. Following are the steps to find the inverse of a matrix. Step 1: Find the value of the determinants A. That is, find |A| Step 2: If |A| = 0, inve..

The food agency inspected a sample of 500 pastries from a bakery and found that 15 were spoiled. After improving the quality of production, the agency inspected a new sample of 900 pastries from the bakery and found that 20 were spoiled. What is the probability of spoiled pastries after h..

The scores obtained by students in a test are given in the line plot. There is no X above the score 85. What does this indicate? => no student scored 85 or many scored 85 or 85 students scored zero or 85 students wrote the t..

The scores of 9 students of a class in a test are 36, 38, 41, 42, 24, 23, 38, 40 and 24. The mean of these scores is 34. If one more student with a score of 26 is included, how does the mean score get affected? => insufficient informatio..

Which of the following is a biased question? I. Are the movies being released now a days more violent? II. How many girl students does your class have? III. Do you think the improved technology conditions make life easy for an individual? => III only or II and III only or I only..

The line graph shows the scores of Chris in math tests conducted over 7 weeks. What trend does the line graph show? => No trend or Positive trend or Negative trend..

College students played two rounds of golf, one before and the other after the instructions were given. Find the test value. At 99% confidence did the scores improve? First round 80 78 72 69 68 72 Second round 78 82 75 72 65 73 => - 0.714, the scores did not ..

What does stem 5 and leaf 6 represent in the graph? => 56 students or 65 students or score is 56 or score is 65..