What is the probability that a human individual would receive the entire haploid set of chromsomes from his her grandfather ?

A' writes a letter to his friend B and oes not receive a reply, it is known that one out of 'n' letters does not reach it's destination. What is the probability that 'B' didn't receive the letter ? It is certain that 'B' would have replied , if he received the letter.

A' writes a letter to his friend B and oes not receive a reply, it is known that one out of 'n' letters does not reach it's destination. What is the probability that 'B' didn't receive the letter ? It is certain that 'B' would have replied , if he received the letter.

What is the empirical probability that an engineer lives : more than or equal to 7 km from her place of work ?

What is the empirical probability that an engineer lives : less than 7 km from her place of work ?

What is the empirical probability that an engineer lives : within 1/2 km from her place of work ? 12

What is the probability that in a group of two people, both will have the same birthday, assuming that there are 365 days in a year and no one has his/her birthday on 29th Fabruary ?

Distance (in km) of 40 engineers from their place of residence to their place of work were found as follows. What is the empirical probability that an engineer lives. more than or equal to 7 km from her place of work ?