allerySum of 5 consecutive integers is 60. The largest is:
- 14
- 10
- 16
- 12
Show answer and solution
Correct answer: A. 14
5 consecutive: n, n+1, n+2, n+3, n+4. Sum = 5n + 10 = 60 → n = 10. Largest = n+4 = 14.
RRB NTPC Elementary Statistics — practice questions
Explore 58 free Elementary Statistics questions in RRB NTPC Mathematics. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 1–30 of 58.
Sum of 5 consecutive integers is 60. The largest is:Read the answer and worked solution →What is the mean of the numbers 4, 8, 12, 16 and 20?Read the answer and worked solution →The mean of five numbers is 18. What is their sum?Read the answer and worked solution →What is the median of 3, 9, 5, 7, 11, 1 and 13?Read the answer and worked solution →What is the mode of 2, 3, 3, 5, 5, 5, 7, 7?Read the answer and worked solution →Which statement describes the data 3, 3, 6, 6, 9?Read the answer and worked solution →Five numbers have mean 10. A sixth number 16 is added. What is the new mean?Read the answer and worked solution →Six numbers have mean 15. After 25 is removed, what is the mean of the other five?Read the answer and worked solution →For the data 1, 2, 3, 4, the mean and the median are both equal to?Read the answer and worked solution →What is the mean of the first five natural numbers?Read the answer and worked solution →Every value in a data set is raised by 5. The old mean was 20. What is the new mean?Read the answer and worked solution →Four friends are aged 20, 22, 24 and 26 years. What is their mean age?Read the answer and worked solution →A test has marks 70 (weight 1) and 85 (weight 2). What is the weighted mean?Read the answer and worked solution →Scores 60 (weight 3) and 80 (weight 2) give what weighted mean?Read the answer and worked solution →Five numbers have mean 12 and three of them have mean 10. What is the mean of the other two?Read the answer and worked solution →20 pupils average 60 marks and 30 pupils average 70. What is the overall average?Read the answer and worked solution →If the mean of 4, 6, x and 10 is 7, what is the value of x?Read the answer and worked solution →Three numbers have mean 14 and two of them are 10 and 12. What is the third?Read the answer and worked solution →For incomes 10, 12, 14, 16 and 200 (in thousands), which average best shows the middle?Read the answer and worked solution →What is the range of the data 12, 7, 25, 3 and 18?Read the answer and worked solution →A set has largest value 96 and smallest value 38. What is its range?Read the answer and worked solution →A measure of dispersion equals zero when the data values are?Read the answer and worked solution →The standard deviation of heights measured in metres is expressed in which unit?Read the answer and worked solution →A very large variance in a data set indicates that the data are?Read the answer and worked solution →If Q1 = 29 and Q3 = 45, what is the interquartile range?Read the answer and worked solution →The median equals which percentile of the data?Read the answer and worked solution →The median is also known as which quartile?Read the answer and worked solution →The median divides an ordered data set into how many equal parts?Read the answer and worked solution →Which measure is greatly influenced by outliers?Read the answer and worked solution →In a normal distribution, the mean, median and mode are?Read the answer and worked solution →
Worked practice questions
What is the mean of the numbers 4, 8, 12, 16 and 20?
- 14
- 10
- 16
- 12
Show answer and solution
Correct answer: D. 12
The sum is 60 and dividing by the 5 values gives 12.
The mean of five numbers is 18. What is their sum?
- 95
- 85
- 80
- 90
Show answer and solution
Correct answer: D. 90
Sum equals mean times count, so 18 x 5 = 90.
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