If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.
a, b. No inferences being made. c. There is no data for other nights, so this is an inference.
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. See your later post.
We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.
To get help, you need to post specific questions.
Proportion = # in category/total number
When you have specific data, it is descriptive. When you go outside the actual data, it is inferential. 1. a, b and c infer. 2. a describes, b and c infer.
Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores. Reverse process with last question, starting with .90.
coitus, genes, traits?
Was the girl cloned? Otherwise it is not exact.