Question

Can someone help me with this ? :) thank you

200 item aptitude test was given to third year and fourth year students in a high school the data obtained are:

for third year:
number of students: 300
mean deviation: 80
standard deviation : 24

for fourth year students:
number of students: 200
mean deviation: 100
standard deviation : 30

a. how many of the third year students are better that the average fourth year students?

b. how many of the fourth year students got better than the average third year students?

Answer 1

c. what is the percentile equivalent among fourth yearstudents ofthose who are in 75th percentile rank the the third year students?

d. how many of the fourth year students got scores higher than the highest scoreof the third year student, assume that all scores of both years fall between z=15

e. how many of the third year students got scores lower than the equivalent score of the 16th percentile rank of the fourth year students?

thank you guys in advance :)