Answer:
The sample size is

Explanation:
From the question we are told that
The population variance is

The mean is

The margin of error is E = 0.15
Generally the standard deviation is mathematically represented as

=>

=>

From the question we are told the confidence level is 99% , hence the level of significance is
=>
Generally from the normal distribution table the critical value of
is
Generally the sample size is mathematically represented as
![n = [\frac{Z_{(\alpha )/(2) } * \sigma }{E} ] ^2](https://img.qammunity.org/2021/formulas/mathematics/college/j63im5d7bkeqfrgf56wd02g4fvud45p15n.png)
=>
![n = [(2.58 * 1.2 )/(0.15) ] ^2](https://img.qammunity.org/2021/formulas/mathematics/college/hgtbkj71iy0or6ql8s9al7j3btuekwxdl5.png)
=>
