A Coin Is Tossed 20 Times

question 192

Multiple Choice

A coin is tossed 20 times. A person who claims to have extrasensory perception is asked to predict the outcome of each flip in advance. She predicts correctly on 14 tosses. What is the probability of being correct 14 or more
Times by guessing? Does this probability seem to verify her claim? Use the normal distribution to approximate
The desired probability.

• A) 0.0582, no
• B) 0.4418, no
• C) 0.4418, yes
• D) 0.0582, yes

---

Definitions:

Erythema

Diffuse redness over the skin because of capillary congestion and dilation of the superficial capillaries.

Verrucae

Warts; small, circumscribed elevations of the skin formed by hypertrophy of the papillae.

Itch Mite

A small parasitic arachnid that can cause severe itching and skin irritation, such as the one responsible for scabies.

Folliculitis

A staphylococcal infection of a hair follicle.