Question

the mean of the five numbers is 15 and the other 9 numbers is 45 find the mean of the all numbers​

Answer 1

Answer:

This the the answer

HOPE IT WILL HELP YOU

HOPE IT WILL HELP YOUPLEASE MARK ME AS BRAINLIST

Answer 2

Answer:

The mean of the all numbers is 34.28 (approx).

Step-by-step explanation:

Given :

Mean of 5 numbers = 15

Mean of 9 other numbers = 45

To find :

The mean of all numbers

Solution :

$\textbf{Case I -}$

• Mean = 15
• Number of observations = 5
• Sum of Observations = y

$\bigstar{\boxed{\sf{Mean = \frac{Sum \: of \: Observations}{No. \: of \: Observations}}}}$

$\sf{\longrightarrow} \: 15 = \dfrac{y}{5} \\ \\ \sf{\longrightarrow} \: y = 15 \times 5 \\ \\ \sf{\longrightarrow} \: y = 75$

$\rule{300}{1.5}$

$\textbf{Case II -}$

• Mean = 45
• Sum of Observations = x
• Number of Observations = 9

$\sf{\longrightarrow} \: 45 = \dfrac{x}{9} \\ \\ \sf{\longrightarrow} \: x = 45 \times 9 \\ \\ \sf{\longrightarrow} \: x = 405$

$\rule{300}{1.5}$

$\textbf{Mean of all the Numbers -}$

• Number of Observations = (9 + 5)
• Sum of Observations = (405 + 75)

$\sf{\longrightarrow} \: \dfrac{405 + 75}{9 + 5} \\ \\\sf{\longrightarrow} \: \dfrac{480}{14} \\ \\ \sf{\longrightarrow} \: 34.28 \: ...(approx)$

$\therefore$ The mean of the all numbers is 34.28 (approx).