Q68.The mean of the numbers a, b, 8, 5, 10 is 6 and their variance is 6. 8. If M is the mean deviation of the numbers about the mean, then 25M is equal to (1) 60 (2) 55 (3) 50 (4) 75
What This Question Tests
This question involves calculating mean, variance, and mean deviation about the mean for a set of numbers, requiring careful application of the definitions.
Concepts Tested
Formulas Used
Mean = (Σxᵢ)/n
Variance = (Σxᵢ²)/n - (mean)²
Mean Deviation about Mean = Σ|xᵢ - mean| / n
📚 NCERT Sections This Tests
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1.3 Define the following terms: (i) Mole fraction (ii) Molality (iii) Molarity (iv) Mass percentage.
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9.6 A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. The angle of minimum deviation is measured to be 40°. What is the refractive index of the material of the prism? The refracting angle of the prism is 60°. If the prism is placed in water (refractive index 1.33), predict the new angle of minimum deviation of a parallel beam of light.
📋 Question Details
- Chapter
- Statistics
- Topic
- Measures of Dispersion
- Year
- 2022
- Shift
- 26 Jun Shift 1
- Q Number
- Q68
- Type
- MCQ
- NCERT Ref
- Class 11 Mathematics Ch 15: Statistics
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