Question

the mean of the five observations is 17.if the mean of the first three of these observations is 15 and that of the last three is 18.find the excluded number​

Answer 1

Step-by-step explanation:

sum=mean *no of obs

=17*5=85

and first three sum=15*3=45

last three sum=18*3=54

so required=(54+45)-85

=99-85=14

Answer 2

Answer:

24

Step-by-step explanation:

sum of first three = 45

sum of last three = 54

sum of first three & last three = 99

sum of all the five observations = 75

the excluded number​ = 99 -75 = 24