Question
What is the value of the z-score for x = 125 if population mean and variance are 121 and 4 respectively?
This question was previously asked in
SSC CGL 2017 (Tier 1) Previous Year Paper (16-Aug-2017) (Shift 1)
The correct answer is
1
The z-score is \(z=\dfrac{x-\mu}{\sigma}\) with \(\sigma=\sqrt{\text{variance}}=\sqrt{4}=2\).
\[z=\frac{125-121}{2}=2\]
The computed value is 2, but the marked option is 1; the answer key appears inconsistent with the stated data.
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Important Questions from Coefficient of Variation
Consider the following statements:
1. Coefficient of variation depends on the unit of measurement of the variable.
2. Range is measure of dispersion.
3. Mean deviation is least when measured about median.
Which of the above statements are correct?In a study of two groups, the following results were obtained:
Group A
Group B
Sample size
20
25
Sample mean
22
23
Sample standard deviation
10
12
Which of the following statements is correct?
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