lucicorona70
Answered

Welcome to Westonci.ca, the ultimate question and answer platform. Get expert answers to your questions quickly and accurately. Connect with professionals ready to provide precise answers to your questions on our comprehensive Q&A platform. Discover detailed answers to your questions from a wide network of experts on our comprehensive Q&A platform.

The number of miles that regular tires last has a normal distribution with a mean of 50,000 miles and a standard deviation of 8,200 miles if a random sample of 4 tries are selected ,what .is the probability that means number of miles they last is more then 60,000 miles?
use this standard normal table to calculate this probability.
A.0.0025
B.0.0075
C.0.0559
D.0.9925

Sagot :

fichoh

Answer:

B.0.0075

Step-by-step explanation:

Given that:

Mean, m = 50,000

Standard deviation, s = 8200

Sample size, n = 4

P(x > 60,000) :

Zscore = (x - m) / s÷sqrt(n)

Zscore = (60000 - 50000) / 8200 ÷2

Z = 10000 / 4100

Z = 2.4390243

P(Z > 2.439)

Using the Z probability calculator :

P(Z > 2.439) = 0.007364

This is closest to B.0.0075 in the option.

We appreciate your time. Please revisit us for more reliable answers to any questions you may have. Thank you for your visit. We're committed to providing you with the best information available. Return anytime for more. Your questions are important to us at Westonci.ca. Visit again for expert answers and reliable information.