128.Referring to Table 6-5, what is the probability that thetime interval between two consecutive defective light bulbs will be at least 80 minutes?129.Referring to Table 6-5, what is the probability that thetime interval between two consecutive defective light bulbs will be at least 90 minutes?TYPE: PR DIFFICULTY: ModerateKEYWORDS: uniform distribution, probability130.Referring to Table 6-5, the probability is 50% that the time interval between two consecutive defective light bulbs will fall between which two values that are the same distance from the mean?

10922.5 and 67.5TYPE: PR DIFFICULTY: DifficultKEYWORDS: uniform distribution, value131.Referring to Table 6-5, the probability is 75% that the time interval between two consecutive defective light bulbs will fall between which two values that are the same distance from the mean?Referring to Table 6-6, what is the probability that thenext hit at the web site will occur between the next 1.2 and 1.5 seconds after just being hit by a visitor?ANSWER:11.25 and 78.75TYPE: PR DIFFICULTY: DifficultKEYWORDS: uniform distribution, value132.Referring to Table 6-5, the probability is 90% that the time interval between two consecutive defective light bulbs will fall between which two values that are the same distance from the mean?ANSWER:4.5 and 85.5TYPE: PR DIFFICULTY: DifficultKEYWORDS: uniform distribution, valueTABLE 6-6The interval between consecutive hits at a web site is assumed to follow an exponential distribution with an average of 40 hits per minute.133.Referring to Table 6-6, what is the average time between consecutive hits?ANSWER:0.025 minutesTYPE: PR DIFFICULTY: EasyKEYWORDS: exponential distribution, mean134.Referring to Table 6-6, what is the probability that thenext hit at the web site will occur within 10 seconds after just being hit by a visitor?135.Referring to Table 6-6, what is the probability that thenext hit at the web site will occur within no sooner than 5seconds after just being hit by a visitor?ANSWER:0.0357TYPE: PR DIFFICULTY: ModerateKEYWORDS: exponential distribution, probability136.Referring to Table 6-6, what is the probability that thenext hit at the web site will occur between the next 1.2 and 1.5 seconds after just being hit by a visitor?TYPE: PR DIFFICULTY: ModerateKEYWORDS: exponential distribution, probabilityCHAPTER 7: SAMPLING DISTRIBUTIONS