Plz slove all the question 15 to 23 plz slove allthe question not one question

Plz slove all the question 15 to 23 plz slove allthe question not one question IS Arithmetic mean of 100 items Of a series is 40. Later on, it was discovered that two values of 53 and 24 were Wrongly taken in place of 35 and 22. Find out the correct mean. Ans. 39.8 There are two branches Of an establishment employing 100 and 80 persons respectively. If the arithmetic mean Of the monthly salary paid by the two branches are t275 and t 225 respectively, find the arithmetic mean of the salaries of the employees of the establishment as a Whole. 17. Calculate combined mean from the following data : Gro up 3 200 250 300 Ans. 252.8 25 15 • 240 Ans. Xl.2.3 _JBcThe average marks in statistics obtained by 30 students is 52. The average marks Of top 6 students is 31. Calculate the average marks Of the remaining students. Ans. 57.25 19. Find out the missing frequency in the following data : 0-10 5 The arithmetic mean is 27. 10-20 20-30 15 16 40-50 6 Ans. 8 __Äind out the missing frequency in the following series, if the value of mean is 29. x: f: 5 5 15 7 25 35 18 21. Find out the value of median of the following data 6, 9, 10, 12, 18, 19, 23, 24, 28, 37, 48, 49, 53 22 From the following data, calculate the value of median : 2 3 4 5 6 310 380 330 420 500 480 45 5 8 560 23. Calculate the value of median from the following table : x: f: 58 2 59 3 60 6 61 15 62 10 7 540 63 5 64 4 Ans. 65 3 55 3 Ans. 12 Ans. M 23 9 10 390 410 66 Ans. M -6'

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) 
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

 

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