HSC Commerce कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Business Mathematics and Statistics

The annual salaries of employees in a large company are approximately normally distributed with a mean of $50,000 and a standard deviation of $20,000. What percent of people earn more than $75,000

X is a normally distributed variable with mean µ = 30 and standard deviation σ = 4. Find P(X < 40)

X is a normally distributed variable with mean µ = 30 and standard deviation σ = 4. Find P(X > 21)

X is a normally distributed variable with mean µ = 30 and standard deviation σ = 4. Find P(30 < X < 35)

The birth weight of babies is Normally distributed with mean 3,500g and standard deviation 500g. What is the probability that a baby is born that weighs less than 3,100g?

People’s monthly electric bills in Chennai are normally distributed with a mean of ₹ 225 and a standard deviation of ₹ 55. Those people spend a lot of time online. In a group of 500 customers, how many would we expect to have a bill that is ₹ 100 or less?

What is population?

What is sample?

What is statistic?

Define parameter

What is sampling distribution of a statistic?

What is standard error?

Explain in detail about simple random sampling with a suitable example

Explain the stratifi ed random sampling with a suitable example

Explain in detail about systematic random sampling with example

Explain in detail about sampling error

Explain in detail about non-sampling error

State any two merits of simple random sampling

State any three merits of stratified random sampling

State any two demerits of systematic random sampling