Structure of the Atom ) Factoid
The diameter of the average atom is
only one tenth of one billionth of one
meter, but these tiny atoms are the
building blocks of everything. Atoms are
made of electrons, protons, and
neutrons, and they are held together by
the charges that the protons and
electrons carry: each proton carries a
positive charge and each electron carries
a negative charge. The total charge of
an atom is the sum of the charges from
its electrons and protons, and the total
charge of a molecule is the sum of the
total charges of the atoms making up
the molecule.
Key
- eleştron
proton
neutron

Amachine that produces a special type of transistor (a component of computers) has a 2% defective rate. the production is considered a random process where each transistor is independent of the others. (a) what is the probability that the 10th transistor produced is the first with a defect? (b) what is the probability that the machine produces no defective transistors in a batch of 100? (c) on average, how many transistors would you expect to be produced before the first with a defect? what is the standard deviation? (d) another machine that also produces transistors has a 5% defective rate where each transistor is produced independent of the others. on average how many transistors would you expect to be produced with this machine before the first with a defect? what is the standard deviation? (e) based on your answers to parts (c) and (d), how does increasing the probability of an event a↵ect the mean and standard deviation of the wait time until success?