The correct answer is D.
This is because a converse statement switches the places of the hypothesis and conclusion.
<span>solution:
we have, mean =8.4 hrs, std. deviation = 1.8 hrs, sample size n = 40 , X = 8.9
Probability(X<8.9) = ?
we know that, Z = (X - mean)/(std. deviation/(sqrt. n)) = (8.9 - 8.4)/(1.8/(sqrt.40))
Z = 1.7568
from standard normal probabilities table, we have , P(Z<1.7568) = 0.9608
Hence, probability that the mean rebuild time is less than 8.9 hours is 0.9608</span>
Answer:
True
Step-by-step explanation:
When two events are disjoints then both events does not occur at the same time.
The intersection of both events is 0
Tossing a coin and getting a tail or head are the two disjoint events
To find the number of outcomes of disjoint sets, we add the number of each event like we add the number of outcomes of getting head and tail .
So, its true
<span>all real numbers less than or equal to 7</span>
It depends on where each train its heading is both trains destination is 600 miles apart from each other then, Train A is going 70mph so divide 600 by 70 to get 8.57 round it up to get 8.58 then multiply by 70 to get 600.4 round down to get 600. Train B is going 80mph so divide 600 by 80 to get 7.5 then multiply by 80 to get 600. The trains should be 600 mi apart by 1 hour and 14 minutes.