X15.1.57 The score distribution shown in the table is for all students who took

Question

X15.1.57 The score distribution shown in the table is for all students who took a yearly AP statistics exam. An AP statistics teacher had 61 students preparing to take the AP exam. Though they were obviously not a random sample, he considered his students to be "typical" of all the national students. What's the probability that his students will achieve an average score of at least 3? Percent of students 13.6 21.9 25.3 17.2 22.0 The probabability that his students will achieve an average score of at least 3 is (Round to four decimal places as needed.)

Explanation / Answer

P( average score of alteast 3 )

= P(X>=3)

= P(X=3)+P(X=4)+P(5)

= 25.3+17.2+22 = 64.5 %

So, 0.6450 is the probability that his students will acheive an average score atleast 3 is 64.5%

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