Answer:
Step-by-step explanation:
Express Courier Service has found that the delivery time for packages is normally distributed. So we use
z = (x - mean)/standard deviation
mean = 13
standard deviation = 2
x = time of delivery in hours
a) P(0 lesser than/equal to 18)
z = (18-13)/2 =5/2 = 2.5
Using the normal distribution table, the value is 0.9938
b) to be 95% sure, let the time be t
From the table, the equivalent of z that is 0.95 = 1.645
So 1.645 = (t-13)/2
t-13 = 3.29
t = 3.29+13= 16.29 hours
Answer:
2 × - 1
Step-by-step explanation:
Answer:
-5<-3 -12<2, or if you meant to write -3-12 together giving -15, it would be -5>-15<2
Step-by-step explanation:
When multiplying we ADD the exponents so:-
a^2 * a^k = a^(2+k) = a^6
so 2 + k = 6
making k = 4
400euros a month because 3,500x1.3687 would be 4790.45 and then divide by 12 to get 399.20 and you would round up because there is change