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# the approximate average of the first 15 even numbers and the first 21 odd numbers is

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### Mohammed

Guys, does anyone know the answer?

get the approximate average of the first 15 even numbers and the first 21 odd numbers is from screen.

## Average of First 15 Even Numbers

getcalc.com's average of first n even numbers calculator, formulas, examples and workout to find what is the mean or average value of first 15 even numbers. (2 + 4 + 6 + . . . . + 28 + 30)/15 = 240/15 = 16

HomeMath FunctionsAverage CalculatorFirst 15 Even Numbers

## What is the Average of First 15 Even Numbers?

getcalc.com's average of first n even numbers calculator to find what is the mean or average value of first 15

even numbers. 16 is an average of first 15 even numbers mentioned in the below table, by substituting the total sum and count of numbers in the formula. The corresponding formulas, chart, examples and workout may help students, teachers or professionals to learn, teach or practice the average of first n natural numbers calculation.

## Numbers Chart

The below chart is the complete list of first 15 even numbers for user reference.

First 15 Even Numbers Chart (2 - 30)

2 4 6 8 10 12 14 16 18 20

22 24 26 28 30

## how to find the average of First 15 Even Numbers?

The below workout with step by step calculation shows how to find what is the average of first 15 even numbers manually.

step 1

Input values:

The first 15 even numbers

2, 4, 6, . . . . , 28, 30

step 2

Find the sum of first 15 even numbers

2 + 4 + 6 + . . . . + 28 + 30 = 240

step 3

Divide the sum by 15

240/15 = 16

16 is an average of first 15 natural numbers or positive integers.

### Average of Natural, Odd, Composite and Prime Numbers

The below are the other calculators to find the average of natural, even, composite and prime numbers.

More Solved Examples

स्रोत : getcalc.com

## [Solved] Find the average of the first 21 odd numbers.

Given: The first 21 odd numbers Formula used: $${S_n}\ =\ {n\over 2}\ × {[2a\ +\ (n\ -\ 1)d]}$$     Sn = The sum of the n numbers, n = T

Home Quantitative Aptitude Average

## Find the average of the first 21 odd numbers.

This question was previously asked in

DSSSB JE CE 2019 Official Paper Shift 1 (Held on 23 Oct 2019)

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12 21 14 19

Option 2 : 21

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## Detailed Solution

Given:

The first 21 odd numbers

Formula used:

Sn = n2 ×[2a + (n − 1)d]

Sn = The sum of the n numbers, n = The total numbers, a = The first term and d = The common terms

Calculation:

Let us assume the average of the first 21 numbers be X

⇒ The first term = 1, The common difference = 2 and n = 21

⇒ The sum of the first odd numbers =

Sn = 212 ×[2 ×1 + (21 − 1) × 2]

⇒ Sn = (21/2) × (42) = 441

⇒ The average of the first 21 odd numbers = 441/21 = 21

∴ The required result will be 21.

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## More Average Questions

Q1. The average of 25 numbers is 48.2. If the average of the first 10 numbers is 47 and the average of the last 12 numbers is 49, then find the average of 58, 69 and the remaining numbers.Q2. Renu's marks were wrongly entered as 99 in place of 9. Due to this error, the average marks of the class were 2.25 more than the actual average. What is the number of students in the class?Q3. Find the value of

2k+11

, where k is average of 16, 25, 13, 26 and 15.

Q4. The average of 30 numbers is 55. The average of the first 15 numbers is 51 and the average of the last 12 numbers is 56. What is the average of 68, 74 and the remaining 3 numbers?Q5. The mean of a certain number of observations is 12. If one observation is removed and the mean remains unaltered, then the removed observation is:Q6. The average height of a class of 30 students is 1 m 50 cm. 6 new students increase the average height to 1 m 55 cm. Determine the average height of the 6 new students.Q7. The sum of three consecutive odd numbers is 165. What is the sum of the largest number and twice the smallest number?Q8. The average age of all the 16 professors of LK University is 52 years. After four years what will be the average age of all the 16 professors if there is no retirement or recruitment?Q9. The average of five numbers is 78. If the average of the first two numbers is 54 and the average of the last two numbers is 63, then the third numbers is:Q10. There are four different numbers. The average of the first three numbers is three times the fourth number, and the average of all the four numbers is 55. What is the average of the first three numbers?

स्रोत : testbook.com

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