# يسرى عبداللطيف طاشكندي

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Quiz 324

2nd semester

1428-1429

Q1: The mean Vitamin D level was 16 with a variance of 12 . Assume that the distribution is normal.

[1] The Vitamin level equal to 15.5 is :

(a) 0.4443          (b) 0          (c) 0.5557           (d) none of these

[2] The Vitamin level is at least 17.01 is :

(a) 0.6141          (b) 0.3859          (c) 0.9015           (d) none of these

[3] The Vitamin level is at most 18  is :

(a) 0.8078          (b) 0.1922          (c) 0.9664           (d) none of these

[4] The Vitamin level is from 17.6 to 19.7 is :

(a) 0.8577          (b) 0.6772          (c) 0.1805           (d) none of these

Q2: The area under the standard normal distribution which

[5] less than 1.72 is

(a) 0.0427                  (b) 0.9772                  (c) 0.9573                (d) none of these

[6] greater than - 0.88 is

(a) 0.1894                  (b) 0.8106                  (c) 0.9104                (d) none of these

[7] between 1.3 and 1.72 is

(a) 0.9573                  (b) 0.9032                  (c) 0.0541                (d) none of these

Q3: If X is a random variable is normally distributed with mean 10 and variance 36. Then the value of X which satisfies

is : [8]

(a) 20.02                     (b) – 20.02                  (c) 20                    (d) none of these

Using the standard normal tables, then the value of which satisfies

is : [9]

(a) 1                           (b) – 1                          (c) 0                      (d) none of these

Q4: If  of all patients with high blood pressure (ضغط دم مرتفع) have bad side effects (آثار جانبية) from a certain medicine (دواء معين).

[10] Then the approximate probability that among 120 patients with high blood pressure, more than 32 will have bad side effects from this medicine is

(a) 0.1711                 (b) 0.8289                   (c) 0.9599              (d) none of these

Good Luck

Yusra Tashkandi

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