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lorasvet [3.4K]
3 years ago
14

Glaucoma is a disease of the eye that is manifested by high intraocular pressure. The distribution of intraocular pressure in th

e general population is approximately normal with mean 16 mm Hg and standard deviation 3 mm Hg.
(a) What percentage of people have an intraocular pressure lower than 12 mm Hg?
(b) Fill in the blank. Approximately 80% of adults in the general population have an intraocular pressure that is greater than ________ (how many?) mm Hg.
Mathematics
1 answer:
lana [24]3 years ago
8 0

Answer:

(a) 9.18% of people have an intraocular pressure lower than 12 mm Hg.

(b) 80% of adults in the general population have an intraocular pressure that is greater than 13.47 mm Hg.

Step-by-step explanation:

We are given that the distribution of intraocular pressure in the general population is approximately normal with mean 16 mm Hg and standard deviation 3 mm Hg.

Let X = <u><em>intraocular pressure in the general population</em></u>

So, X ~ Normal(\mu=16,\sigma^{2} = 3^{2})

The z score probability distribution for normal distribution is given by;

                             Z  =  \frac{ X-\mu}{\sigma } }  ~ N(0,1)

where, \mu = population mean = 16 mm Hg

           \sigma = standard deviation = 3 mm Hg

(a) Percentage of people have an intraocular pressure lower than 12 mm Hg is given by = P(X < 12 mm Hg)

       P(X < 12) = P( \frac{ X-\mu}{\sigma } } < \frac{ 12-16}{3 } } ) = P(Z < -1.33) = 1 - P(Z \leq 1.33)

                                                   = 1 - 0.9082 = <u>0.0918</u> or 9.18%

The above probability is calculated by looking at the value of x = 1.33 in the z table which has an area of 0.9082.

(b) We have to find that 80% of adults in the general population have an intraocular pressure that is greater than how many mm Hg, that means;

        P(X > x) = 0.80      {where x is the required intraocular pressure}

        P( \frac{ X-\mu}{\sigma } } > \frac{ x-16}{3 } } ) = 0.80

        P(Z > \frac{ x-16}{3 } } ) = 0.80

Now, in the z table the critical value of z which represents the top 80% of the area is given as -0.842, that is;

                           \frac{ x-16}{3 } } = -0.842

                           x -16 = -0.842 \times 3

                           x = 16 - 2.53 = <u>13.47</u> mm Hg

Therefore, 80% of adults in the general population have an intraocular pressure that is greater than 13.47 mm Hg.

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