#46 which of the following statements about the foci and the eccentricity is cor
ID: 2884725 • Letter: #
Question
#46 which of the following statements about the foci and the eccentricity is correct? (A) The foci are (0, -3V3) and (O, 3v3), and the eccentricity is 13/2 O (B) The foci are (0,-313) and (0, 3.3), and the eccentricity is 13 O(C) The foci are (-313, 0) and (313, 0), and the eccentricity is 3/2 (D) The foci are (-313, 0) and (313, 0), and the eccentricity is v3 The reading test scores for the population of fifth graders is normally distributed with a mean of 55 and a standard deviation of 8 #47 what percentage of fifth graders score less than 637. (a) 68% (b) 84% O (c) 95% O (d) 97.5% In a ninth grade homeroom class, 3 of the 16 girls have red hair and 2 of the 15 boys have red hair. What is the probability of selecting a boy or a red-haired person as homeroom representative to student council?: * O(a) 18/31 (b) 5/31 O(c)2/31 O (d) 3/31 #49 You draw a two-card hand from a standard deck of 52 cards, what is the probability of drawing a hand that contains two kings?:* (B) 1/13 o (c)1/26 O (D) 1/221Explanation / Answer
49. Number of ways of selecting 2 kings = 4C2
Number of ways of selecting 2 cards from a deck of 52 cards = 52C2
Probability of drawing a hand that contains 2 kings = 4C2/ 52C2 = 6/1326 = 1/221
option (D) is correct
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