from a handpicked tutor in LIVE 1-to-1 classes

# The rainfall (in mm) in a city on 7 days of a certain week as recorded as follows:

(i) Find the range of the rainfall in the above data.

(ii) Find the mean rainfall of the week.

(iii) On how many days was the rainfall less than the mean rainfall.

**Solution:**

(i) Highest of the rainfall (in mm) = 20.5, Lowest of the rainfall (in mm) = 0.0

Range of the rainfall = Highest rainfall – Lowest rainfall

= 20.5 – 0.0

= 20.5 mm

(ii)Total number of days = 7

Record of the rainfall (in mm) = 0.0, 12.2, 2.1, 0.0, 20.5, 5.5, 1.0

Mean of the rainfall (in mm) = Sum of rainfalls (in mm) / Number of days

= (0.0 + 12.2 + 2.1 + 0.0 + 20.5 + 5.5 +1.0) / 7

= 41.3 / 7

= 5.9 mm

(iii) On 5 days rainfall was less than the mean rainfall i.e., Monday, Wednesday, Thursday, Saturday, and Sunday.

**☛ Check: **Class 7 Maths NCERT Solutions Chapter 3

**Video Solution:**

## The rainfall (in mm) in a city on 7 days of a certain week as recorded as follows:(i) Find the range of the rainfall in the above data. (ii) Find the mean rainfall of the week. (iii) On how many days was the rainfall less than the mean rainfall?

NCERT Solutions Class 7 Maths Chapter 3 Exercise 3.1 Question 8

**Summary:**

The rainfall (in mm) in a city on 7 days of a certain week was recorded. i) Range of the rainfall in the above data is equal to 20.5 mm, ii) Mean rainfall of the week is equal to 5.9 mm, iii) On 5 days rainfall was less than the mean rainfall i.e., Monday, Wednesday, Thursday, Saturday and Sunday.

**☛ Related Questions:**

- Find The Mean Of The First 5 Whole Numbers
- A Cricketer Scores The Following Runs In Eight Innings 58 76 40 35 46 45 0 100 Find The Mean Score
- Following Table Shows The Points Of Each Player Scored In Four Games Now Answer The Following Questions I Find The Mean To Determine As Average Number Of Points Scored Per Game
- The Marks Out Of 100 Obtained By A Group Of Students In A Science Test Are 85 76 90 85 39 48 56 95 81 And 75 Find The I Highest And The Lowest Marks Obtained By The Students

visual curriculum