Question

SCore: U.14 Of 1 pt 8 of 13 (13 complete)w HW Score: 56.82%, 7.39 of 13 pts 8.1.22-T EQuestion Help Suppose a geyser has a mean time between eruptions of 86 minutes. Let the interval of time between the enuptions be nomally distrbuted with standand deviation 20 minutes. Complete parts (a) through () below (a) What is the probability that a randomly selected time interval between enuptions is longer than 94 minutes? The probability that a randomly selected ime interval is longer than 94 minutes is approximately 3446 (Round to four decimal places as needed.) (b) What is the probability that a random sample of 18 Sime intervals between enuptions has a mean longer than 94 minutes? The probability that the mean of a random sample of 18 time intervals is more than 94 minutes is approximaely (Round to four decimal places as needed.) 2 Enter your answer in the answer box and then click Check Answer Clar All parts nemaining Book Air

Answer 1

z -*- N( 0, 1) =86 : 20 P(x794) 20 P (z> .40) =P CZ< -0.40) -> Symmihc abou- meah ENORMSDIST (-0.40) O.344 6 z = X- 20 n P(x>94) 94-86 ) PCZ> P (z> 1. 70 ENORMSDIJT (-170) 0.044

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Normsdist is a Excel function