Question

The arithmetic mean of 12 observations is7.5.If the arithmetic mean of 7 of these observations is 6.5,the mean of remaining observations is

Answer 1

Answer:

$10$

$252652$

Answer 2

The mean of remaining observation is 8.9.

Step-by-step explanation:

Since we have given that

Number of observation = 12

Arithmetic mean = 7.5

So, it becomes,

$\dfrac{\sum x}{12}=7.5\\\\\sum x=7.5\times 12\\\\\sum x=90$

Number of observation = 7

Mean = 6.5

So, it becomes

$\dfrac{\sum x_1^7}{7}=6.5\\\\\sum x_1^7=6.5\times 7=45.5$

So, the mean of  remaining observation would be

$45.5+\sum _7^{12}=90-45.5=44.5\\\\So,\\\\\bar{x}=\dfrac{44.5}{5}=8.9$

Hence, the mean of remaining observation is 8.9.

# learn more:

The Arithmetic mean of 12 observation is 7.5 if the arithmetic mean of 7 of this observation is 6.5 the mean of the remaining observation is?​

https://brainly.in/question/13950152