Question

8. The rainfall (in mm) in a city on 7 days of a certain week was recorded as follows:(Rainfall in mm)
Mon 0.0
Tue 12.2
Wed 2.1
Thurs 0.0
Fri 20.5
Sat 5.5
Sunday 1.0
(1) Find the range of the rainfall in the above data.
) Find the mean rainfall for the week.
(ii) On how many days was the rainfall less than the mean rainfall.
plz answer fast and step by step​

Answer 1

Question:

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

(Rainfall in mm)

Mon - 0.0

Tue - 12.2

Wed - 2.1

Thurs - 0.0

Fri - 20.5

Sat _ 5.5

Sunday - 1.0

1. Find the range of the rainfall in the above data.
2. Find the mean rainfall for the week.
3. On how many days was the rainfall less than the mean rainfall.

Solution:

1. Range = Maximum value - Minimum value

So, the maximum value of rainfall (in mm) is 20.5 in Friday & the minimum value of rainfall (in mm) is 0.0 in Thursday.

⟹ 20.5 - 0.0

⟹ 20.5

2. Mean = $\frac{sum \: of \: observation}{number \: of \: observation}$

⟹ $\frac{0.0+12.2+2.1+0.0+20.5+5.5+1.0}{7}$

⟹ $\frac{41.3}{7}$

⟹ 5.9

Answers:

1. Range = 20.5
2. Mean = 5.9
3. On 4 days the rainfall was less than mean rainfall.

Answer 2

Answer:

answer

1. 20.5
2. 5.9
3. 5 days

Step-by-step explanation:

step by step

1. Range: Maximum value - mininmum value

So, the maximum value of rainfall (in mm) is 20.5 in friday and the minimum value of rainfall (in mm) is 0.0 in thursday.

=20.5 - 0.0

=20.5

2. Mean: Sum of observation\number of observation.

=0.0+12.2+2.1+0.0+20.5+5.5+1.0\ 7

= 41.3\ 7

= 5.9.

3.answer:

On 5 days the rainfall was less than mean rainfall.