Question

A stemplot of the IQ test scores from 78 seventh-grade students in a rural midwestern school is provided. 7/24 7 79 8 69 90133 96778 10 0 0 2 2 3 3 3 3 4 4 10 5 5 5 6 6 6 777789 11000011112 2 2 2 3 3 3 4 4 4 4 11 55688999 1200 3 3 44 126 77888 1302 136 (Key: 712 = 72)

Answer 1

If we count the number of leaves for each stem after removing 4 outliers we get - stem - 8 9 10 11 12 13 No. of 2 8 29 27 12 3 leaves 37th value Total number of leaves of datar points - 2 + 8 + 22 + 27 + 12 + 3 - 74 u after removing outliers.

central value will be 37th or 38th value. ereason 7th or (7) 2+1)th If we count from left to eight we get that 2+8+22=32, so 37th value will be in stem 11 - If we count in stem 11 from left to eight in given data, we get that

37th and 38th both are Ill. so we get that 0 The distribution is enoughly symmetric with center near lll and range is from 86 to 136. range from lowes value in data set upto the highest value in data set so and option is correct. rom

(6) Number of students having IQ below hundred in - 72 74 77 79 86 89 90 91 93 93 96 97 97 98 100 100 means 16 student. Number of students having hundred = 78-16 = 62. IQ above % of student having IQ more than 100 = 52 x100 = 79.5 %