math
posted by smartypants .
please help cuz i been trying for ages and cant get the answer
each telephone call made to the emergency services either is or is not legitimate. suppose that each call received has probability 0.02 that it is not legitimate. assume that the legitimacy of one call is independent of whether or not other calls are legitimate.
(the choices of answers are at the bottom of the page)
QU1) whats the closet option that they receive at least 100calls before they receive one which is not legitimate?
qu2) whats the closet option that in 150calls at least one is not legitimate?
the choices of answers are:
0.003
0.014
0.048
0.133
0.668
0.681
0.867
0.952
Q1) probability of exactly 100 consecutive "good" calls = (0.98)^100 = 0.133
That satisfies the "at least 100" criterion.
Q2)The probability that all of 150 calls are legitimate is (0.98)^150 = 0.048. One minues that, or 0.952, is the probability that at least one is NOT legitimate.
Respond to this Question
Similar Questions

math
100 people set up a phone call system so that the initial contact person call three persons, each of whom calla three persons,and so on until all have been contacted. The maximum people who do not need to make calls is? 
math
i would like any help or suggestions you have please as i am very stcuk on these questions thanks here is the scene: each phone call made to the emergency services has probability 0.02 that it is not legitimate. assume that the legitimacy … 
Math
Each year (365 days) the fire department receives 270 emergency calls on average. In a give 7day week, what is the probability of receiving A. no calls b. more than one call c. one call or less d. at least two calls please help and … 
Algebra
How do you represent each answer as an algebraic expression using the variable mentioned? 
math
lisa made a longdistance telephone call to her friend Jane. the cost was $.42 for the fist minute and $.19 for each additional minute. what was the total length of the call if it cost $2.89 
math
The cost of a telephone call is $0.75 + $0.25 times the number of minutes. Write an algebraic expression that models the cost of a telephone call that lasts t minutes. i got C= 0.75 + 0.25t am i correct? 
math
Telephone company A charges $3.00 for the first minute of any long distance call and $0.50 for each additional minute. Telephone company B charges $2.00 for the first minute of any long distance call and $0.70 for each additional minute. … 
Math
The cost of a telephone call is $0.75 + $0.25 ties the number of minutes. Write an algebraic expression that models the cost of a telephone call that lasts t minutes. 
algebra
The cost of a telephone call is $0.75 + $0.25 times the number of minutes. Write an algebraic expression that models the cost of a telephone call that lasts t minutes. 
algebra 1
The cost of a telephone call is $0.75+$0.25 times the number of minutes. Write an algebraic expression that models the cost of a telephone call that last t mminutes. $0.75 + 0.25 * t