When estimating a population mean are you more likely to be correct when you use a point estimate or an interval estimate

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample