The waiting time WW for accessing one record from a computer database is a random variable uniformly distributed between 00 and 2020 milliseconds. The read time RR for moving the information from the disk to the main memory is 55 milliseconds. The random variable XX milliseconds is the total access time (waiting time read time) to get one block of information from the disk. Before performing a certain task, the computer must access 66 different blocks of information from the disk. (Access times for different blocks are independent of one another.) The total access time for all the information is a random variable A milliseconds. Compute the following: a. E[X]
b. Var[X]
c. E[A]

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step-by-step explanation:

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given : the shape of his satellite can be modeled by   where x and y are modeled in inches.

now,the given equation   is a equation of parabola.

here, coefficient of x is positive, hence the parabola opens rightwards.

on comparing this equation with standard equation , we get

in standard equation, coordinates of focus=(0,m)

thus for given equation coordinates of focus=(0,1.5)

step-by-step explanation:

answer: a

step-by-step explanation: the answer is a due to the rule of symmetry; that a line of symmetry must divide a figure into 2 pieces that are the exact same, only reflected over a line of symmetry. b and c do not have lines of symmetry and would not divide the figure evenly, thus making the answer a.