HSC Commerce Class 12 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Business Mathematics and Statistics

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

State any two merits for systematic random sampling

Using the following Tippet’s random number table

Draw a sample of 10 three-digit numbers which are even numbers

 A wholesaler in apples claims that only 4% of the apples supplied by him are defective. A random sample of 600 apples contained 36 defective apples. Calculate the standard error concerning of good apples

A sample of 1000 students whose mean weight is 119 lbs (pounds) from a school in Tamil Nadu State was taken and their average weight was found to be 120 lbs with a standard deviation of 30 lbs. Calculate the standard error of the mean

A random sample of 60 observations was drawn from a large population and its standard deviation was found to be 2.5. Calculate the suitable standard error that this sample is taken from a population with standard deviation 3?