Question: Back at Tinker Air Force Base, the specifications for a bolt used in an aircraft MRO application require that the ultimate tensile strength be at

Back at Tinker Air Force Base, the specifications for a bolt used in an aircraft MRO application
require that the ultimate tensile strength be at least 18 kN. It is known that 10% of the bolts
have strengths less than 18.3 kN and that 5% of the bolts have strengths greater than 19.76 kN.
Assume that the uncertain tensile strengths of bolts follow a normal distribution.
a. What proportion of the bolts meet the strength specification?
b. You pick five bolts out of a bin. What is the probability that at least four of them meet
the strength specification

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