The average marks of subject Maths and English is

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RRB NTPC Exam 27 Jan 2021 click here to view all questions

The average marks of a student in Maths and English is 90. If the student scored 85 marks in Maths, what were their marks in English?

A90

B120

C110

D115

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A man was travelling half of the total distance at a speed of 30 km/h and the rest distance at the speed of 50 km/h. What was the average speed of the man on his whole journey?

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A man was travelling half of the total distance at a speed of 30 km/h and the rest distance at the speed of 50 km/h. What was the average speed of the man on his whole journey?

A40 km/hr

B37.5 km/hr

C42.5 km/hr

D35 km/hr

Akhilesh ? Apr 3 '25 at 21:17

correct answer is: 37.5 km/hr
Explanation: To find the average speed for the entire journey,

we use the formula for average speed when covering equal distances:

$$\text{Average Speed} = \frac{2 \times v_1 \times v_2}{v_1 + v_2}$$ where $v_1 = 30$ km/h and $v_2 = 50$ km/h.

Plugging in the values:

$$\text{Average Speed} = \frac{2 \times 30 \times 50}{30 + 50} = \frac{3000}{80} = 37.5 \text{ km/h}$$

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Find the mean of the given set value. Set = {27, 26, 17, 25, 43, 19, 37, 10}

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RRB NTPC Exam 27 Jan 2021 click here to view all questions

Find the mean of the given set value. Set = {27, 26, 17, 25, 43, 19, 37, 10}

A24

B25.5

C27.5

D29

Akhilesh ? Apr 1 '25 at 20:39

correct answer is: option b (b)[25.5]
Explanation: The mean of a set of numbers is calculated by summing all the numbers in the set and then dividing by the total number of elements in the set. In this case, we sum the numbers: 27 + 26 + 17 + 25 + 43 + 19 + 37 + 10 = 204. Then, we divide by the number of elements, which is 8. Thus, the mean is 204 / 8 = 25.5.

• Option a: This is incorrect because the sum of the numbers divided by the count is not equal to 24.
• Option b: This is the correct answer as (27 + 26 + 17 + 25 + 43 + 19 + 37 + 10) / 8 = 204 / 8 = 25.5.
• Option c: This is incorrect because the sum of the numbers divided by the count is not equal to 27.5.
• Option d: This is incorrect because the sum of the numbers divided by the count is not equal to 29.

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Find the median of the given set value. Set = {37, 17, 53, 7, 13, 57, 23, 19}

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RRB NTPC Exam 27 Jan 2021 click here to view all questions

Find the median of the given set value. Set = {37, 17, 53, 7, 13, 57, 23, 19}

A10

B18

C21

D25

Akhilesh ? Apr 1 '25 at 20:38

correct answer is: option c (21)
Explanation: The median is the middle value in a sorted dataset. First, we must arrange the set in ascending order: {7, 13, 17, 19, 23, 37, 53, 57}. Since there are 8 numbers (an even number), the median is the average of the two middle numbers. The two middle numbers are 19 and 23. The median is calculated as (19 + 23) / 2 = 42 / 2 = 21.

• Option a: 10 is incorrect because it is far from the actual middle value after sorting the data.
• Option b: 18 is incorrect. While it's closer to the sorted values, it's not the average of the two middle numbers.
• Option c: 21 is the correct median, calculated as the average of 19 and 23.
• Option d: 25 is incorrect because it's too high compared to the middle sorted values.

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The mean temperature of Monday and Thursday was 36°C. If the temperature on Thursday was $\frac{4}{5}$ th of that of Monday, then what was the temperature on Thursday ?

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INSURANCE EXAMS (NICL) 2013 click here to view all questions

The mean temperature of Monday and Thursday was 36°C. If the temperature on Thursday was $\frac{4}{5}$ th of that of Monday, then what was the temperature on Thursday ?

A36.5°C

B32°C

C35.5°C

D34°C

Akilesh Kharvi ? Jun 29 '2020 at 9:2

Correct answer is: 32°C

Explanation:

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