In a box of floppy discs is known that 95% will work.A sample of three of the discs is selected at random.Find the probability that(i)none

The probability that a machine will produce all bolts in a production run within specification is 0.998.A sample of 8 machines is taken at random.Calculate the probability that (i)all 8 machines.

The probability that a lamp in a classroom will be burnt out is 0.3.Six such lamps are fitted in the classroom.If it is known that the classroom is unusable if the number of lamps burning in it is less than four,find the probability that the classroom cannot be used on a random occasion.

The probability that a lamp in a classroom will be burnt out is 0.3.Six such lamps are fitted in the classroom.If it is known that the classroom is unusable if the number of lamps burning in it is less than four,find the probability that the classroom cannot be used on a random occasion.

Out of 80 students in a class , 30 passed in Mathematics, 20 in Electronics and10 in both. If one students is selected at random. The probability that the student has passed in none of the subject is