Explanation

• The square of standard deviation is called variance.
• Standard deviation measures how much data deviates from the mean.
• Variance helps in understanding data spread or dispersion in statistics.

Additional information:

• Formula: Variance (σ²) = (Standard Deviation)²
• Range = Difference between largest and smallest values.

Last verified on 16-01-2026

Explanation

Explanation

1 gram = 1000 milligrams (mg)

Gram and milligram are metric system units of mass.

Commonly used for measuring precious metals, medicines, and chemicals.

Additional Details / Facts

1 kilogram = 1000 grams = 1,000,000 milligrams

Gold purity is often measured in karats along with weight in grams or milligrams

Metric system is internationally standard

Explanation

1 yard = 0.9144 meters

It is a unit of length used in the imperial system.

Commonly used in sports, construction, and measuring fabrics.

Additional Details / Facts

1 yard = 3 feet = 36 inches

Widely used in USA, UK, and some Commonwealth countries

Used for short distances and measurements in daily life

Explanation

Number of students who filled form for the entrance test = 200

The number of students who appeared in the test = 180

Percent of appeared students who passed = 70%

Percent of appeared students who failed = 100% - 70% = 30%

so, the number of students who failed the test would be

= 30/100 * 180

= 0.3 * 180

= 54

**

ND22-1-2023