Hello, I need assistant and step by step working to understand especially question 2c.

Question: The weight of a population of individuals is normally distributed with a mean 65 kg and a standard deviation of 11 kg.

Based on your cases, solve the following problems using the continuous probability distribution techniques.

1. a)State the mean, standard deviation and variance of the population.
2. b)Describe how the normal curve will look when the mean decreases and the standard deviation increases.
3. c)Calculate the amount for the top and bottomkthpercentage of the population, wherekis18%

Write down your answers with appropriate workings and illustrations of diagrams.