Answer: A. 1000
Step-by-step explanation:
The number of digits used to fill the three digits space (0,1,2....9) = 10
Since, she cannot discern the last three digits, so there can be repetition of digits in the last three digits.
Therefore, the number of possible phone numbers must Lauren dial if she is to be certain the she will eventually dial the correct number=
Hence, the possible phone numbers must Lauren dial if she is to be certain the she will eventually dial the correct number = 1000
The required probability of success is given by 0.98906500
Assume the random variable X has a binomial distribution with the given probability of obtaining a success.
P(X<5), n=6, p=0.3
In binomial distribution for number trials we are investigating the probability of getting a success remain the same.
n = number of trails,
p = probability of success
x = the number of success
p(x<5) = P(x=0)+ p(x=1) + p(x=2)+p(x=3)+p(x=4)
=
p(x<5) = 0.98906500
Thus the required probability of success is given by 0.98906500
Learn more about Binomial distribution here:
brainly.com/question/14565246
#SPJ1