Bacteria begins to grow on the water's surface in a non-operational swimming pool on September 20. The bacteria grows and covers
the water's
surface in such a way that the area covered with bacteria doubles every day. If it continues to grow in this way, the water's surface will be
entirely covered with bacteria on September 28.
When will a quarter of the water's surface be covered?
O A.
The water's surface will be covered a quarter of the way on September 24.
B.
The water's surface will be covered a quarter of the way on September 26.
C.
The water's surface will be covered a quarter of the way on September 27.
OD. The water's surface will be covered a quarter of the way on September 25.
surface in such a way that the area covered with bacteria doubles every day. If it continues to grow in this way, the water's surface will be
entirely covered with bacteria on September 28.
When will a quarter of the water's surface be covered?
O A.
The water's surface will be covered a quarter of the way on September 24.
B.
The water's surface will be covered a quarter of the way on September 26.
C.
The water's surface will be covered a quarter of the way on September 27.
OD. The water's surface will be covered a quarter of the way on September 25.
2 answers:
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Answer:
Let X be the event of feeling secure after saving $50,000,
Given,
The probability of feeling secure after saving $50,000, p = 40 % = 0.4,
So, the probability of not feeling secure after saving $50,000, q = 1 - p = 0.6,
Since, the binomial distribution formula,
Where,
If 8 households choose randomly,
That is, n = 8
(a) the probability of the number that say they would feel secure is exactly 5
(b) the probability of the number that say they would feel secure is more than five
(c) the probability of the number that say they would feel secure is at most five