Can someone please help me with this lab Each group had to t

Can someone please help me with this lab? Each group had to throw 100 darts (10 groups so 1000 darts total) and this is the data we all came up with.

I need to answer these questions, but I have no clue how. Any help/explanations would be appreciated!!!
a) One definition of an experiment well done is a small SDM. By what factor must we increase the number of darts thrown to decrease SDM by a factor of 4 if the sdm remains the same?

b) Compare the SDM/s from the groups from table II with the sd(x?) calculated in table IIa. What do these numbers represent?

c) Through an examination of class total data from Table II, what would you give as an estimation (with an uncertainty) for the mean of the means of all physics lab classes throwing darts this week?

d) If a random person in the class were to throw a single dart, what is the probability that it would land in bin 23? what about 29?

PLEASE HELP, anything would help me out so much because I am so confused at what these questions are asking!! Thank you!!

Solution

Species distribution model:

mean of means = 24.80
standard deviation of the means = 0.48

In part A) Basically it means that suppose you throw N darts then tthere is some SDM.Now If you throw more darts, then SDM will decrease.
Suppose instead of N, you throw N*k darts and the SDM now is 1/4 of the SDM for N darts. So actually you need to find the value of K.