Answer:
Since the number of feet = 50
We can start by taking the number of puppies as 10(Trial and Error Method)
Since puppies have 4 feet,
10 puppies will have 40 feet.
Parrots have 2 feet so the remaining pets, i.e., 5 parrots will have 10 feet.
Therefore the total = 50 feet
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Answer:
250 cubic m
Step-by-step explanation:
volume of the Olympic grid pool

Answer:
The probability that 8 mice are required is 0.2428.
Step-by-step explanation:
Given : A scientist inoculates mice, one at a time, with a disease germ until he finds 3 that have contracted the disease. If the probability of contracting the disease is two sevenths.
To find : What is the probability that 8 mice are required? The probability that that 8 mice are required is nothing ?
Solution :
Applying binomial distribution,

Where, p is the probability of success 
q is the probability of failure q=1-p, 
n is total number of trials n=8
r=3
Substitute the values,




Therefore, the probability that 8 mice are required is 0.2428.