The pacemakers are implants that are used for the regulation of heartbeats (correction of irregular heartbeats).
It is a small device, implanted (minor surgical procedure) just under the skin of the chest, that sends electrical impulses to the heart muscle to maintain a suitable heart rate and rhythm.
The pacemaker has two parts:
· the leads which are threaded through the veins into the heart and implanted into the heart muscle. They send impulses from the pulse generator to the heart muscle. There can be one or more leads depending on the type of the heart problem
· a pulse generator which contains the battery and a tiny computer and resides just under the skin of the chest.
Each impulse causes the heart to contract. A pacemaker may also be used to treat different heart issues such as fainting spells (syncope), congestive heart failure, and hypertrophic cardiomyopathy.
A.
0.257
B.
0.284
C.
0.312
D.
0.356
E.
0.548
1. The probability that a person who is older than 35 years has a hemoglobin level between 9 and 11 is 0.284.
2. The probability that a person who is older than 35 years has a hemoglobin level of 9 and above is 0.531.
Probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur, or how likely it is that a proposition is true. The probability of an event is a number between 0 and 1, where, roughly speaking, 0 indicates impossibility of the event and 1 indicates certainty.
Given
Let the number of person who is older than 35 years has a hemoglobin level between 9 and 11 be x.
From the given table it is clear that the total number of person who is older than 35 years is 162.
76+x+40 = 162
116+x = 162
x = 46
The number of person who is older than 35 years has a hemoglobin level between 9 and 11 is 46.
1.The probability that a person who is older than 35 years has a hemoglobin level between 9 and 11 is
P = 46/162 = 0.62
The probability that a person who is older than 35 years has a hemoglobin level between 9 and 11 is 0.284.
Person who is older than 35 years has a hemoglobin level of 9 and above is 40+46 = 86
The probability that a person who is older than 35 years has a hemoglobin level of 9 and above is
P = 82/162 = 0.531
The probability that a person who is older than 35 years has a hemoglobin level of 9 and above is 0.531.
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The answer is Changes in the shape of earth orbit. If the earth's orbit put the earth closer to the sun, then the global temperatures of the earth would rise permanently. Conversely, if the orbit change puts the earth further from the sun, then the earth global temperature would drop permanently.
b. False
A- populations change over time in response to changes in the environment
B- that all species are clones
C- populations never change
D- individuals have the same genes
Answer: The correct answer for the blank is-
a. support the multiregional model.
Multiregional model is a scientific model that provides explanataion of pattern of evolution of modern humans. It is an alternative explanation of Out of Africa model.
According to this model, modern humans that are present around the world (that in various regions or multiregions of the world) show similarity to the Homo erectus found in Africa.
In other words, species of human beings first originated in Africa as Homo erectus, which then underwent subsequent human evolution upon dispersing in various regions around the world. These species include all archaic forms of human like Homo erectus, Neanderthals, and evolved worldwide as Homo sapiens ( modern human forms).
Thus, option a) is the right answer.