math scores

The line plot represents the number of students who got different scores in a math quiz. What is the difference between the number of students who scored 15 points and those who scored 5 points? => 8 or 10 or 7 or 9..

The line plot represents the number of students who got different scores in a math quiz. What is the difference between the number of students who scored 30 points and those who scored 5 points? => 3 or 1 or 2 or 0..

The bar graph shows the number of students of each grade who scored 75% or more in a math test. Compared to the students of grade 4, how many more students of grade 6 scored 75% or more in math? => 15 or 5 or 20 or 10..

The bar graph shows Roberts score on Math, Science, and French tests conducted from September to December. In which month was his average score the highest? => September or October or December or November..

The reaction time to a stimulus for a certain drug has a mean of 2.5 seconds and a standard deviation of 0.3 seconds. Find the z score for a reaction time of 3.1 seconds. => 2 or 18.67 or 0.2 or 7.33..

The average number of pens sold by a shopkeeper in the first half and second half of a month are 315 and 300. If the standard deviations are 30 and 35, then find the z score value and verify the difference between both the means at 90% of confidence. => 0.106, both the means do not differ..

Two populations have means of 29.5 and 28 and variances of 6 and 7.8. If the sizes are 30 and 43, then find the z score values. Verify whether the mean of the first population is greater than that of the other at 99% of confidence or not. => 3.93, not greater or 0.57, greater or 2.43, not..

The average number of physically handicapped people in 25 sections of 2 colleges are 6 and 4 with standard deviations 1.2 and 1.5. Find out the z score value and verify if the mean number of PHC people differ in both the colleges at 99.73% level of confidence. => 0.2952, differ or 5.21, d..

If the average number of steps between any two stairs of a 20 storyed building is 14 and that of 25 storyed building is 12 with the variances 8 and 10.23, find the z score value and verify if the mean number of steps between any two stairs of both the buildings differ significantly at 98%..

Joe scored 28.5 in math and 36.5 in science. Find his total score in both the subjects. => 36.5 or 65 or 79 or 98.5..