Post-exposure radiation levels are approximately normally distributed. the levels (in sv) of a random sample of three trauma victims who were recently exposed are 5.5, 6.2, and 4.8. a 95% confidence interval for the mean based on these data is:

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m.the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

Why do electron microscopes have higher resolving power than light microscopes?

Name three different units of energy used to measure heat and describe what type of situations each is usually used.