I would like some assistance with the following probability distrution and inference for mean and population exercise

I would like detailed explanation as well

16. A local group of researchers is interested in the number of adults in St. Ann who are over the age of 30. Data is collected from 620 adults and 124 of them are found to be over the age of 30. The local research group would like to estimate the proportion of adults p, in St. Ann, over the age of 30 years old. Calculate the sample size required so that the maximum error ofthe estimate is within 0.0? with 95% confidence. A\"21? 3126 [2216 DZST E-SS F125 [3258 H-SQ 1?. The department of Physics would like to determine whether students prefer practical or theory assignments. The department emails a survey asking students to participate. What type of sampling method is being used? llVoluntary Random Sample EStratified Random Sample IIIMultistage Random Sample DSimple Random Sample ECluster Random Sample 18. which is the best measure to use to describe the diagram labeled ll? A range Binterquartile range (3 standard deviation [Itvariance 19. The subject options available to Endyear Economics students at The University ofThe West Indies. What type of graph is best used in the given situation? Ahistogram BOgive CStem and Leaf Plots DPie Chart EBar Graph 20. It is known that the weight of cows is normally distributed with an average of 1400 lbs and a standard deviation of 200 lbs. In a random sample of 50 cows} what is the probability that a cow weighs less than 1355 lbs? AD.9441 3-0.5909 00.0559 DU.4DQO