Answer:
251
Step-by-step explanation:
Given - Mean length of fish = μ= 73 cm
SD σ =8 c m
Number of fish having a length greater than 57 cm out of 480.
Find the value of z at x = 57
[tex]z= \frac{x-\mu}{\sigma} = \frac{57-73}{8}\\=\frac{-16}{8} = -2[/tex]
Area between z = − 2 and z = ∞
= Area between z = − 1 and z = 0 +
Area between z = 0 and z = ∞
=0.02275+0.5= 0.52275
Therefore number of fish having teeth greater than 57 cm
= 0.52275*480 = 5.2275*48 = 250.92 ≅251
