The monthly salaries in ? of 30 workers in a factory are given below:5000, 7000, 3000, 4000, 4000, 3000, 3000, 3000,8000, 4000, 4000, 9000, 3000, 5000, 5000, 4000,4000, 3000, 5000, 5000, 6000, 8000, 3000, 3000,6000,7000,7000,6000, 6000,4000 From the above data find the mean of monthly salary.

The monthly salaries in Rs. of 30 workers in a factory are given below:5000, 7000, 3000, 4000, 4000, 3000, 3000, 3000,8000, 4000, 4000, 9000, 3000, 5000, 5000, 4000,4000, 3000, 5000, 5000, 6000, 8000, 3000, 3000,6000,7000,7000,6000, 6000,4000 From the above data find the mean of monthly salary.

In an election, a party hired a firm to promote its candidate in three ways , telephone calls, house calls and letters. The cost per contact (in paise) is respectively 40, 100 and 50. The number of contacts in cities A and B are 1000, 500, 5000 and 3000, 1500 and 7500 respectively. Express the information using matrices and use the algebra of matrices to get the total amount spent in each city,

How many numbers can be made with the digits 3, 4, 5, 6, 7, 8 lying between 3000 and 4000 which are divisible by 5 while repetition of any digit is not allowed in any number

Sachin invested some amount in National Savings certificates in a specific way. In the first year, he invested Rs 4000, in the second year Rs 6000, in the third year Rs 8000 and so on for 12 years . Find the total amount he invested in 12 years.

Assuming that the temperature at the surface of the Sun is 6000 K, find out the size of a virtual star (in terms of the size of Sun) whose surface temperature is 3000 K and the power radiated by the virtual star is 25 times the power radiated by the Sun. Treat both, the Sun and virtual star as a blackbody.

Read the following passage write the appropriate amount in the boxes and discuss. Govind, who is a dry land farmer from Shiralas has a 5 acre land. His family inclde his wife two children and his old mother. He borrowed one lakh twenty five thousand rupees from the bank for one year as agriculatral loan at 10 p.c.p.a . He cultivated soyabean in x acres and cotton and tur in y acres. He spent Rs. 10,000 on seeds. The expenses for fertilizers and pesticides for the soyabean crop was 2000x rupees and 4000x2 rupees were spent on wages and cultivation of land. He spent 8000 y rupees on fertilizers and pesticides and rupees 9000 y2 for wages and cultivation of land for the cotton and tur crops. Let us write the total expenditure on all the crops by using variables x and y. rupees. He harvested 5x2 quintals soyabean and sold it at Rs. 2800 per quintal. The cotton crop yield was 5/3y2 quintals which fetched Rs. 5000 per quintal. The tur crop yield was 4y quintals and was sold at Rs. 4000 per quintal. Let us write the total income in rupees that was obtained by selling the entire farm produce, with the help of an expression using variables x and y. square + square + square rupees

A telephone company in the town has 5000 rent charges of ₹ 3000 per year from each person. The company proposes to increase the annual rent and it is believed that for every increases of ₹ 1, in the rent, one subscriber will be discontinued. Find what increased annual rental will bring the maximum annual income to the company.

In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V . If the incident light is changed to 3000 Å , then the potential required to stop the ejection of electrons will be