In a study of wait at an amusement park, the most popular roller coaster has a mean wait time of 17.4 minutes with a standard deviation of 5.2 minutes. if 14 days are randomly selected, find the probability that the mean wait time is between 10 & 20 minutes. a: 0.9693b: 0.0471c: 0.6713d: 0.9470

Option A is right

0.9693

Step-by-step explanation:

X is a random variable

X is normal with mean time = 17.4 minutes

Std deviation = 5.2 minutes

No of days = 14

Sample size =14

Std error =std dev /sq rt 14

=1.39

Required probability

=P(10<x<20)

=P(-7.4/1.39<z<2.6/1.39)

= P(-5.32<z<1.87)

=0.9693

Option A is right

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

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