Certain model of television picture tubes

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Records show that 10% of a certain model of television picture tubes fail before guarantee has expired. A random sample of 7 picture tubes selected, what is the probability that:

a) Four pictures tubes failed before the guarantee?

b) Less than two pictures tubes fail before the guarantee?

c) more than two pictures tubes meet the guarantee?

Please show formula and it has 3 questions

Reference no: EM131474123

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