हिंदी

Find the variance and standard deviation of the following scores on an exam: 92, 95, 85, 80, 75, 50.

Advertisements
Advertisements

प्रश्न

Find the variance and standard deviation of the following scores on an exam: 92, 95, 85, 80, 75, 50.

संख्यात्मक
Advertisements

उत्तर

Given scores: 92, 95, 85, 80, 75, 50

Step 1: Calculate Mean 

`"Mean" = (92+95+85+75+50)/6`

= `477/6`

= 79.5

Step 2: Calculate Variance

`"Variance" = sum(x-barx)^2/n`

Score Deviation (x-79.5) Square
92 12.5 156.25
95 15.5 240.25
85 5.5 30.25
80 0.5 0.25
75 -4.5 20.25
50 -29.5 870.25

Sum of squares = 1317.5

Variance = `1317.5/6`

= 219.58

Step 3: Calculate Standard Deviation

Standard Deviation = `sqrt219.58`

= 14.82

  • Variance = 219.58
  • Standard Deviation = 14.82
shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 3: Data Handling using Pandas - II - Intext Questions [पृष्ठ ७४]

APPEARS IN

एनसीईआरटी Informatics Practices [English] Class 12
अध्याय 3 Data Handling using Pandas - II
Intext Questions | Q 6. | पृष्ठ ७४
Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×