1 point The weights of laboratory cockroaches follow a Normal distribution with
mean 80 grams and standard deviation 2 grams. Use the figure from above.
About what percent of the cockroaches have weights less than 78 grams?
16%
none of these
32%
34%
O 2.5%

16% of the cockroaches have weights less than 78 grams.

Option A is correct.

Step-by-step explanation:

Mean = 80 g

Standard Deviation = 2

We need to find percent of the cockroaches have weights less than 78 grams so, x=78

First we will find z using formula:

Putting values of x, mean and Standard Deviation to find z

We need to find P(z<-1)

Looking in the normal distribution table

So, 16% of the cockroaches have weights less than 78 grams.

Option A is correct.

d

step-by-step explanation:

d

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step-by-step explanation: