The following are the ages (years) of 5 people in a room 16,25,23,12,17 a person enters the room the mean age of 6 people is now 20 what is the age of the person who entered the room

he age of the person who entered the room = 27 years

Step-by-step explanation:

Step 1

Mean  Age  = total of the ages of observation / numbers of people with the ages

Step 2

Let the sixth person's age be represented as x

such that the mean ages of the 6 people inside the room be given as

Mean =Total ages  of 6 people / 6  

20 = Total ages  of 6 people / 6  

(16+25+23+12+17+ x) / 6 = 20

93+ x / 6 = 20

93+ x= 6 x 20

93+ x= 120

x= 120 - 93

x=27

the age of the person who entered the room = 27 years

(d)

step-by-step explanation:

given: the line in the graph passes through points (5,30) and (6,26).

then, the equation of line is:

now, put y=a(n) and x=n,

hence, option d is correct.

not sure but it may be b, as i said i'm not sure.