Question

27) What would be the expected number of heads turning up in 500 tosses of an unbiased coin?

150, 200 , 300, 250

45)  In general, how do data distributions of incomes of employees in large firms tend to be shaped?

They are most often skewed to the left.

They are most often skewed to the right.    

They are generally symmetric about the mean.

They are generally symmetric about the median.

50) A sample of 26 observations has a standard deviation of 4. What is the sum of the squared deviations from the sample mean?

100

25    

400

21

Answer 1

Q27) As it is an unbiased coin, the probability of getting heads on any toss is given as 0.5. Therefore the expected number of heads in 500 tosses is computed here as:
= 500*0.5

= 250

Therefore 250 is the expected number of heads here.

Q45) As all organisations follows a triangular structure, there are more employees in an organisation with lower salaries and smaller frequency for higher salary employees. Therefore this is a characterization of a positively skewed distribution. Therefore These distributions are most often positively skewed.

Q50) The sum of squared deviations from the sample mean is computed here as:

therefore 400 is the required sum of squared deviations here.