Approx. Probability

How to do this?

 

I think you can use binomial distribution by taking the event ' voting to candidate B' as success (and to A or C as failure). So, that X~Bin(100,47/100) and then find P(X>50). Since the approximate prob. has been asked, you can use Normal approximation to binomial dist. using continuity correction.
I'm not much sure, but I think so. First try this way. Let me know if you don't get answer this way.

 

Thank you. I'm trying and replying you back if the answer matches.

 

The first part matched. The second part is as follows :
A second opinion poll of 150 people was conducted in a different town with the following results :
See fig after that. Can you kindly help me with this? The answer is "test statistic = 2.315, accept H0

 

Use contigency tables, since we are taking a test for difference among 3 proportions. Different voting intentions mean here whether the proportion of voting for candidates differs or not in two towns). See the pic below.

 

Many many thanks for all your help.