1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

# The marks obtained by 40 students in class X of a certain school in a math paper, are presented in the table.The total marks in that exam was 50. Find the mean using direct method. Marks obtainedNumber of students0âˆ’10310âˆ’20420âˆ’301330âˆ’401540âˆ’505

A

28.7

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B

25.2

No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
C

26.4

No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
D

29.9

No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
Open in App
Solution

## The correct option is A 28.7 Class mark for first class interval =upper class limit+lower class limit2=0+102=5 Similarly the class mark for each class interval can be found. Look at the table. Class intervalNo. of students(fi)Class mark(xi)fixi0−10351510−204156020−30132532530−40153552540−50545225Total∑fi=40∑fixi=1150 Mean=∑fixi∑fi=115040=28.75

Suggest Corrections
1
Join BYJU'S Learning Program
Related Videos
China
CIVICS
Watch in App
Explore more
Join BYJU'S Learning Program