d AL stude ayer lest.dspXt test Id=/03 1 3544&cen; tenin-yes ath1530-N41-WithLab

Question

d AL stude ayer lest.dspXt test Id=/03 1 3544&cen; tenin-yes ath1530-N41-WithLab Nicholas PriceI 3/10/18 1:36 uiz: Quiz 5 (Over HW 5) Submit C his Question: 1 pt 11 of 16 (9 complete) This Quiz: 16 pts poss A government agency has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher intercepted messages. In standard English text, a particular letter is used at a rate of 5.5%. a. Find the mean and standard deviation for the number of times this letter will be found on a typical page of 2700 characters =(Round to one decimal place as needed.) b. In an intercepted message, a page of 2700 characters is found to have the letter occurring 188 times. Is this unusual? A. Yes, because 188 is below the minimum usual value O B. Yes, because 188 is greater than the maximum usual value. ° C. No, because 188 is within tho rango of usual values. O D. Yes, because 188 is within the range of usual values. Click to select your answer(s). 11 Review Quiz for Test 3 (Chap 7-9) Optional Extra Practice! pe here to search a/toy

Explanation / Answer

a. n = 2700 p = 0.055

= n * p

= 2700 * 0.055

= 148.5

= (n * p * (1 - p))

= (148.5 * 0.945)

= 11.8462

= 11.8.

b. Using Binomial tables,

P(x >= 188) = 0.0007.

Since the value is very small, the answer is:

B. Yes, because 188 is greater than the maximum usual value.

Related Questions

Navigate

• Browse (All)
• Browse D
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.