Answer:
4+(x*4)
Step-by-step explanation:
Answer:
720 Arrangements
Step-by-step explanation:
Given the numbers could be from 0 - 9 and none of them is to be repeated.
The first place could be filled in 10 ways. (0 - 9)
The second place could be filled in 9 ways. (Excluding the one in the first place).
The third place could be filled in 8 ways. (Excluding the two numbers in the first two places).
Therefore, the total number of arrangements possible for the lock is:
= 720 ways.
Mean is 80 million
Standar deviation is 11 million
Probabiliy of less tha 103 million
First we normalize the values using the fomula:
Z = (x - u)/s
x = 103
u = 80
s = 11
Z = (103-80)/11 = 23/11 = 2.09
Using the standar normal ditribution tables, this value represents: 0.01831
So the probability is 1 - 0.01831 - 0.9817