Question

A distribution table for the scores on an exam is shown belaw. The second row says that 1D% of the students scored between 60 and 70. Fill in the blanks in the height column. Do not include units Points (width)90 (Area)|Heights Area/Width (% 0-60 0.2500 60-70 70-80 25 5000 80-90 30 Computer's answer now shown abave. You are correct. Your receipt no. is 153-3031 What is the median scare? 80 60 50 90 70 Submit Answer Is the average (greater than), (less than), or - (equal to) the median? Hint: Draw the histogram or just look at the distibution table and picture, whether the histogram is symmetrical, or has a long left-hand tail, or long right hand tail Submit Answer Tries 1/2 Previous Tries If 20 points were added to everyone's score (so that the maximum score was 120), the 5D would_ Incorrect increase Incorrect decrease Carrect: stay the same Incorrect Cannot be determined answer now shown above. You are correct. Your receipt no. is 153-3700 r 20 points were just added to the scores of people who failed (the 0-60 interval), the SD would- . Hint--The original scores range from O to 100, if 20 paints were added to ONLY the 0-60 interval, what would be the now range? Does the spread of the scores changc? If so, less spread of more? increase o stay the same Cannot be determined. HINT: Picture how the shape of the histogram would change. Would it spread out more, making the SD bigger? or Would it shrink, making the SD smaller? or would the shape stay the same, making the SD stay the same? Submit Answer Tries 1/2 Previous Tries

Answer 1

1)median score =50th value =80

2)as mean =(30*0.15+65*0.1+75*0.25+85*0.3+95*0.2)=74.25

from above: average is less than (<) to the median

3)stay the same

4)decreases as minimum value is increased therefore range decreases.