Answer:
a)Both X and Y can be well approximated by normal random variables.
Step-by-step explanation:
For each individual, there are only two possible outcomes. Either they are right-handed, or they are left-handed. This means that we can solve this problem using concepts of the binomial probability distribution.
Binomial probability:
Probability of exactly x sucesses on n repeated trials, with probability p.
The binomial probability can be well approximated by normal random variables, using the expected value  and the standard deviation
 and the standard deviation 
Let X be the number of males (out of the 100) who are left-handed.
 and
 and  . Can be well approximated.
. Can be well approximated.
Let Y be the number of females (out of the 80) who are left-handed.
 and
 and  . Can be well approximated.
. Can be well approximated.
The correct answer is
a)Both X and Y can be well approximated by normal random variables.
 
        
             
        
        
        
Answer:
y=-3×5
so'n
y=-15ans
another has no number only one number 2 alphabets
 
        
             
        
        
        
55% were in the rest of the train. it says "d" though, so I can't tell you the exact number. 
        
             
        
        
        
        
Answer:
Mixture problemsare ones where two different solutions are mixed together ... should be added to the first in order to get amixture of 5% salt?4) How much ... 8 6) How many grams of pure acid must be added to 40 grams of a 20% acidsolution to ... make a Mixture that perliter?15) Solution A is 50% acid and solution B is 80% ...
Step-by-step explanation: