The Answer to your problem is:
0.666667
Because the left side of the equation is an absolute value, making it impossible to = to -1.
The standard deviation for the number of seeds germinating in each batch is 1.3
<u>Solution:</u>
<em><u>In binomial distribution, standard deviation is given as:</u></em>

Where "n" is the number of observations
"p" is probability of getting success
We are given that:
Total batches of seed = 8
Probability that a radish seed will germinate is 0.7
Here success is getting radish seed germinated
<em><u>Then, the standard deviation for the number of seeds germinating in each batch.</u></em>
Plugging in values in formula, we get

Therefore the standard deviation for the number of seeds germinating in each batch is 1.3
I attached a photo of the work. I hope it helps!
Answer:
-300
Step-by-step explanation:
z = -21/0.07
z = -300