According to the national institute of allergy and infectious diseases, about 3.7% of american adults have a food allergy. a large company plans a lunch reception for its 400 employees. assume that employees are independent. let the random variable x be the number of company employees who have a food allergy. what is the distribution of x? what are the mean and standard deviation of the distribution of x? using the normal approximation (with continuity correction), determine the probability that at least 20 of the 400 employees have a food allergy.

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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rauschg

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answer: 5100 just subtract

step-by-step explanation:

a. positive: 2 or 0; negative : 2 or 0; complex: 4or2or0