Answer:
the fifth number is 70
Step-by-step explanation:
mean (average) of first 5 numbers =50 , Then sum of this 5 numbers = 50*5 =250.
The mean of 4 numbers = 45 . Sum 4 numbers = 45*4 = 180
the fifth number is 250-180=70
(180 +70)/5=50 which is the mean
