Answer:
Step-by-step explanation:
Let X denote the amount of time spending exercise in a given week
Given that X normal (3.8, (0.8)²)
Thus we know that
![Z= \frac{x-3.8}{0.8} N(0,1)](https://tex.z-dn.net/?f=Z%3D%20%5Cfrac%7Bx-3.8%7D%7B0.8%7D%20N%280%2C1%29)
i)P [ amount of time less than two hour ]
= P[x < 2]
ii)
![P [x < 2]=P[\frac{x-3.8}{0.8} < \frac{2-3.8}{0.8} ]\\\\=P[z](https://tex.z-dn.net/?f=P%20%5Bx%20%3C%202%5D%3DP%5B%5Cfrac%7Bx-3.8%7D%7B0.8%7D%20%3C%20%5Cfrac%7B2-3.8%7D%7B0.8%7D%20%5D%5C%5C%5C%5C%3DP%5Bz%3C-2.25%5D)
= P[z > 2.25] ∴ symmetric
= P[0 ≤ z ≤ ∞] - P[0 ≤ z ≤ 2.25]
= 0.5 - 0.48778
= 0.0122
iii)
P[2 < x < 4]
Answer:
(a) 11.
(b) 5.
Step-by-step explanation:
(a)√124:
11*11 = 121 so an estimate is 11.
(b) ∛124
5*5*5 = 125
So an estimate is 5.
100% C i have already done this
Answer:
4 is answer in my view but i am not sure