The gestation time for cows is normally distributed with a mean of 284 days and a standard deviation of 12 days. at a local ranch over the course of a year they're 820 calf births. of these how many would be expected to have a gestation time of less than 270 days

Step-by-step explanation:

We must calculate the probability that the cows have a gestation time of less than 270 days. If X represents the gestation time of a randomly selected cow, then we look for:

Acora we calculate the Z-score

In this case

So

Looking in the normal standard table we have to

Finally, the expected number of calf "E" that will have a gestation time of less than 270 days is:

E=99.71≈100 Calfs

the awnser is visionary

cause it equals more