Question

At 3:30 pm on a weekday near Cupertino, California, a simple random sample of speeds (mi/h) from southbound traffic on I-280 was taken. What is the mean speed of the sampled vehicles?

a) 61.5 mi/h
b) 60.3 mi/h
c) 63.4 mi/h
d) 58.9 mi/h

Answer 1

To find the mean speed of the sampled vehicles, you need to average the speeds of the vehicles in the sample.

Step-by-step explanation:

To find the mean speed of the sampled vehicles, we need to average the speeds of the vehicles in the sample. Since a simple random sample was taken, we can assume that each vehicle in the sample is representative of the entire population of vehicles on I-280 at that time.

Add up the speeds of all the vehicles in the sample and divide the sum by the total number of vehicles in the sample to find the mean speed.

For example, if the speeds of the sampled vehicles are 55 mi/h, 60 mi/h, 65 mi/h, and 70 mi/h, the mean speed is (55+60+65+70)/4 = 62.5 mi/h.

Therefore, none of the answer choices provided are correct.