Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

9.If the mean of the following data is 91.Find the missing frequency :- C. I.            Frequency 0-30.             12 30-60.           21 60-90.            X  90-120.         52 120-150.        Y  150-180.        11 Total              150
Asked by prajapatisohil573 | 02 Aug, 2021, 10:03: AM
answered-by-expert Expert Answer
   Class           xi               fi                                                  fixi
   0 - 30        15              12                                                180
  30 - 60       45              21                                                945
  60 - 90       75               x                                                 75x
 90 - 120     105             52                                               5460
120 - 150    135              y                                                135y
150 - 180    165             11                                               1815
 
                  Total    sum from blank to blank of f subscript i equals x plus y plus 96 equals 150     sum from blank to blank of f subscript i x subscript i equals 8400 plus 75 x plus 135 y
Now, 96 + x + y = 150
Therefore, x + y = 54
straight x with bar on top equals fraction numerator begin display style sum from blank to blank of end style straight f subscript straight i straight x subscript straight i over denominator begin display style sum from blank to blank of end style straight f subscript straight i end fraction rightwards double arrow 91 equals fraction numerator 8400 plus 75 straight x plus 135 straight y over denominator 150 end fraction rightwards double arrow 13650 equals 8400 plus 75 straight x plus 135 straight y rightwards double arrow 75 straight x plus 135 straight y equals 5250 rightwards double arrow 5 straight x plus 9 straight y equals 350 space space space... space left parenthesis ii right parenthesis Solving space left parenthesis straight i right parenthesis space and space left parenthesis ii right parenthesis comma space we space get straight x space equals space 34 space and space straight y space equals space 20
Answered by Renu Varma | 02 Aug, 2021, 12:24: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test Subjective Questions Webinar Subjective Questions Pre Board Assessment
Answered Unanswered My Questions My Answers
CBSE 10 - Maths
find the mean of 20 numbers such that if the mean of 8 of them is 10 and the mean of 10 of them is 12 the last two numbers are 8 and 12
Asked by amulya2194 | 17 Apr, 2022, 04:46: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
9.If the mean of the following data is 91.Find the missing frequency :- C. I.            Frequency 0-30.             12 30-60.           21 60-90.            X  90-120.         52 120-150.        Y  150-180.        11 Total              150
Asked by prajapatisohil573 | 02 Aug, 2021, 10:03: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
by assume mean method
question image
Asked by 8416mayankkumar | 14 Mar, 2021, 07:35: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Statistics
Asked by Tesbthmarak | 05 Mar, 2021, 09:46: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
solve
question image
Asked by singhshrey918 | 29 Dec, 2020, 10:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
what is statistics
Asked by srilakshmikonakanchi91 | 15 Oct, 2020, 09:12: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
assumed mean method
Asked by rituparn69 | 27 Sep, 2020, 10:59: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Write formula for find out the mean of the data using assumed mean
question image
Asked by baladh676 | 04 Sep, 2020, 03:04: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Mean of 100 numbers was found to be 50. But later on, it was observed that one of the number 150 was wrongly taken as 50
Asked by samarpreetsingh076 | 01 Sep, 2020, 08:07: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
The arithmetic mean of the following frequency distribution is 50 .C.I  0-10 ,10-20, 20-30, 30-40,40-50.frequency:    16      p           30        32     14. Find the value of p  
Asked by Anilkumardelhi73 | 13 Jun, 2020, 10:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt

Be a Top Scorer in the Exam with Test Series and Test Generator!

Enrol Now
×