Plz slove all the question 15 to 23 plz slove allthe question not one question
Dear student,
18) Average marks = total marks / no. of students
52 = Total marks / 30
Total marks = 1560.
Average marks of top 6 students = total marks of top 6 students / 6
31 = total marks of top 6 students / 6
total marks of top 6 students = 186.
Marks of rest of (24) students = marks of 30 students - marks of top 6 students / 24
Marks of rest of (24) students = 1560 - 186 / 24
Marks of rest of (24) students = 1374 / 24 = 57.25
19)
Arithmetic mean = ∑ fx / ∑ f
27 = 1230 + 15x / 42 + x
1230 + 15 x = 42 + x (27)
1230 + 15 x = 1134 + 27 x
1230-1134 = 27 x - 15 x
96= 12 x
x = 8
kindly do not pile up questions in single thread use different threads for different questions.
Regards
18) Average marks = total marks / no. of students
52 = Total marks / 30
Total marks = 1560.
Average marks of top 6 students = total marks of top 6 students / 6
31 = total marks of top 6 students / 6
total marks of top 6 students = 186.
Marks of rest of (24) students = marks of 30 students - marks of top 6 students / 24
Marks of rest of (24) students = 1560 - 186 / 24
Marks of rest of (24) students = 1374 / 24 = 57.25
19)
Class interval | mid point (X) | Frequency (f) | fX |
0-10 | 5 | 5 | 25 |
10-20 | 15 | x | 15x |
20-30 | 25 | 15 | 375 |
30-40 | 35 | 16 | 560 |
40-50 | 45 | 6 | 270 |
Total | 42 + x | 1230 + 15f |
Arithmetic mean = ∑ fx / ∑ f
27 = 1230 + 15x / 42 + x
1230 + 15 x = 42 + x (27)
1230 + 15 x = 1134 + 27 x
1230-1134 = 27 x - 15 x
96= 12 x
x = 8
kindly do not pile up questions in single thread use different threads for different questions.
Regards