A group of scientists seek to answer the question: Is there a relationship between brain size and intelligence? A group of 100 volunteers are recruited for study. Each volunteer agrees to have their brain measured and classified as small, medium, or large. They also take an IQ test which classifies them as above or below average intelligence. The table shows the classification of the volunteers. Brain size Small Medium Large IQ Above average 3 29 20 Below average 7 29 12 (a) Calculate the marginal distribution of brain size. Summarize your findings in a sentence. Here is a mosaic plot of the results of the study. (b) Describe what this graph reveals about the association between brain size and IQ for the 100 volunteers in the study. Justify your response.

Asays "we are both knaves" and b says nothing. exercises 24–31 relate to inhabitants of an island on which there are three kinds of people: knights who always tell the truth, knaves who always lie, and spies (called normals by smullyan [sm78]) who can either lie or tell the truth. you encounter three people, a, b, and c. you know one of these people is a knight, one is a knave, and one is a spy. each of the three people knows the type of person each of other two is. for each of these situations, if possible, determine whether there is a unique solution and determine who the knave, knight, and spy are. when there is no unique solution, list all possible solutions or state that there are no solutions. 24. a says "c is the knave," b says, "a is the knight," and c says "i am the spy."

Don't know how to find x given these segment lengths

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions. a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0