Advertisement Remove all ads

The Mean of 18, 24, 15, 2x + 1 and 12 is 21. Find the Value of X. - Mathematics

Advertisement Remove all ads
Advertisement Remove all ads
Sum

The mean of 18, 24, 15, 2x + 1 and 12 is 21. Find the value of x. 

Advertisement Remove all ads

Solution

Mean of given data =`(18 + 24 + 15 + 2x + 1 + 12)/(5)`

⇒ 21 = `(70 + 2x) / (5)`

⇒ 5 x 21 = 70 + 2x

⇒15 = 70 + 2x

⇒ 2x = 105 - 70

⇒ 2x = 35

⇒ x = `35/2`

⇒ x = 17.5

Concept: Properties of Mean
  Is there an error in this question or solution?
Advertisement Remove all ads

APPEARS IN

Selina Concise Mathematics Class 9 ICSE
Chapter 19 Mean and Median (For Ungrouped Data Only)
Exercise 19 (C) | Q 2 | Page 241
Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×