An investor wants to decide on whether to invest in a certain institution or not. He requested the manager to provide report about the institution's average growing to the report the two are above 40 millions for the past 40 months. Hence determine whether the investor in the institution or not.

Data ya faida kwa miezi 40 iliyopita ni:
56, 31, 47, 43, 41, 47, 33, 48
63, 20, 43, 50, 39, 52, 49, 42
65, 37, 45, 49, 47, 45, 57, 54
61, 40, 48, 32, 52, 53, 37, 55
57, 45, 41, 51, 35, 67, 60, 44

Kuna data pointi 40.

Wastani unakokotolewa kwa kutumia fomula:

Ambapo $n$ ni idadi ya data pointi, ambayo ni 40.

Wastani wa faida ni 47.025 milioni.

Mwekezaji anataka kuwekeza ikiwa wastani wa faida ni juu ya milioni 40.
Kutoka kwa hesabu yetu, wastani wa faida ni milioni 47.025.
Kwa kuwa $47.025 > 40$, sharti la mwekezaji limetimizwa.
Kwa hivyo, mwekezaji anapaswa kuwekeza katika taasisi hiyo.

Uamuzi: $\text{Mwekezaji anapaswa kuwekeza}$