21 women can do a word in 24 days and 18 men can do the same work in 14 days.16 women worked for 5 days and they left. 12 men worked for next 6 days and they were joined by 16 women. In how many days will remaining work be completed
Answers
Answer:
17, 19, 20, 22, 24, 24, 28, 30, 30, 36
(0) Find the mean time taken by the students to complete the test.
(ii) Find the new mean, if another student who took 14 minutes is also included.
4. The enrolment of a school during seven consecutive years was as follows:
1580, 2020, 2580, 3200, 3550, 3710, 4010
(0) Find the mean enrolment of the school for this period.
(ii) Find the new mean, if the enrolment of the current year, that is, 4,270 is also included.
5. In a factory the total number of workers are 25. Out of them, the average monthly salary
of 15 workers is 8,500 whereas the other 10 workers have an average salary of 39,800.
Find the monthly average salary of all the 25 workers.
6. The average salary of 19 workers in a factory is 12,000 per month. If the salary of
the manager is 42,000 per month, find the average monthly salary paid to all the
employees.
7. The mean of nine observations was found to be 35. Later on, it was discovered that an
observation 81 was misread as 18. Find the correct mean of the observations.
3. The mean of five numbers is 27. If one number is excluded, their mean is 25. Find the
excluded observation.