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1. There is a bag with 62 balls. 31 are blue and 31 are red. In 20 pulls from the bag, 20 balls are red. What is the probability with replacement that the 21st pull will be red?
a).5000
b).2500
c).000000477
d).03125
e) none of the above
2.The lengths of time bank customers must wait for a teller are normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute.
A. What proportion of bank customers waits between 3 and 4 minutes
B. What percentage wait more than 4 minutes?
C. What proportion waits between 1 and 3 minutes?
D. What percentage wait less than 1 minute?
Two converging lenses are separated by 23.20 centimeter. The focal length of each lens is 12.20 centimeter. Find the final image distance relative to the lens on the right
Two isotopes of carbon, carbon-12 and carbon-13, have masses of 1.993 10-26 kg and 2.159 10-26 kg, Determine the spatial separation between the two isotopes after they have traveled through a half-circle
A simple pendulum has a length of 1.20 m and a mass of 0.930 kg. Calculate the quantum number n for the pendulum
A rock is dropped from rest at earth surface (g=9.80m/s^2)and reaches the ground in 1.80s. what is the original height of the rock
If the coefficient ofkinetic friction between a 35-kg crate and the floor is 0.3, what horizontal force is required to move the crate at a steady speed across the floor
Suppose that you want to find the equation for a line that passes through the two points (0,3) and (4,9). What is the slope of this line
A car of mass m is initially moving with a velocity v. Find the time that it takes for the car to come to rest
By what factor does the resistance of a copper wire change if its length doubles and its diameter triples? (If the resistance doubles, enter "2"; if it decreases by a factor of three, enter "1/3", etc.)
rocket man has a propulsion unit strapped to his back. he starts from rest on the ground fires the unit and accelerates
Two conductors having net charges of +13 µC and -13 µC have a potential difference of 13.0 Volt between them. Estimate the capacitance of the system
A spring-loaded pellet gun is designed to fire 2.40 g projectiles horizontally at a speed of47.4 m/s. What maximum force is required to load the gun
A 475 kg concrete beam should be raised by a 10.0 m from the ground. How much power is needed to do the job in 24 s
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