Answer Happy

Os of 7th Grade Students The following frequency histogram represents the IQ scores of a random sample of seventh-grade students. IQs are measured to the nearest whole number. The frequency of each class is labeled above each rectangle Use the histogram to answers parts (a) through (a) Q 80 60- 20 20- 52 00 32 1 C H2 22 60 70 80 100 110 120 130 140 10 100 10

(a) How many students were sampled? students (b) Determine the class width The class width is (c) Identity the classes and their frequencies. Choose the correct answer below. O A. 60-70, 2; 70-80, 2, 80-90, 12, 90-100, 47, 100-110, 52; 110-120.40, 120-130, 32, 130-140, 8, 140-150, 4: 150-160. 1 B. 60-69, 2, 70-79.280-89, 12, 90-99. 47, 100-109,52; 110-119, 40, 120-129. 32; 130-139, 8, 140-149.4 150-159, 1 OC. 65, 2; 75, 2, 85, 12, 95, 47: 105, 52, 115, 40, 125, 32, 135, 8: 145, 4, 155, 1 Statcrunch

(d) Which class has the highest frequency O A. 100-110 OB. 100-109 O C. 105 O D. 90-99 (e) Which class has the lowest frequency? O A. 60-69 O B. 155 Statcrunch

(e) Which class has the lowest frequency? O A. 60-69 O B. 155 O C. 150-159 O D. 150-160 (1) What percent of students had an IQ of at lea % (Type an integer or a decimal. Do not round % (g) Did any students have an IQ of 163?

(9) Did any students have an IQ of 163? O A. No, because there are no bars, or frequencies, greater than an IQ of 160 O B. No, because there is a bar in the 150-159 class. O c. Yes, because there is a frequency of a score of 165. OD. Yes, because there is a bar in the 150-159 class.