Question
A physical instructor claims that the mean weight of
students in school is greater than 82 kg with standard deviation 20. If a sample of size 81 students is selected with mean weight of 90. The test statistic equals toSolution
The correct answer is B
- The price of electricity rose by 40%. Ravi, in response, reduced his usage by 25%. Determine the change in his electricity bill.
Ravi scored 35% in an exam and failed by 40 marks. Meena scored 50% and crossed the passing mark by 20 marks. What are the passing marks of the test?
- Rohit used to earn Rs. 42,000 per month. His spending to saving ratio was 5:9. After a salary increment, he reduced his expenses by 20% and his savings inc...
A fruit seller has a certain number of apples of which 10% are rotten. He sells 91% of the remainder and then 405 apples are left. How many apples he bo...
Hari scored 70 marks in English. He scored 64% marks in Hindi and X marks in Maths. The maximum marks for each subject is 175. The overall percentage of...
Monthly income of A is Rs. 55000 out of which he spent 21%, 9% and 22% of his total income in rent, medicine and transportation, respectively. Find his ...
A girl spent 30% of her monthly income on clothing. Of the remaining, she spent on travel and food in the ratio of 4:3. If the difference of the income ...
The income of Tina is Rs.24000 and she saves 15% of her income. The savings of Kajal is Rs.2000 more than that of Tina and she spends 60% of her income....
A candidate who gets 25% marks fails by 12 marks but another candidate who gets 45% marks gets 10% more than the passing marks. Find the maximum marks.
- Ravi appeared for two papers: Physics and Chemistry. He scored 68 out of 80 in Physics and 74 out of 85 in Chemistry. Calculate his total percentage marks.
