Statistics and Probability Answers

(5.2.26) A survey showed that 83​% of adults need correction​ (eyeglasses, contacts,​ surgery, etc.) for their eyesight. If 21 adults are randomly​ selected, find the probability that no more than 1 of them need correction for their eyesight. Is 1 a significantly low number of adults requiring eyesight​ correction?
The probability that no more than 1 of the 21 adults require eyesight correction is?

(5.2.24) Assume that when adults with smartphones are randomly​ selected, ​58% use them in meetings or classes. If 11 adult smartphone users are randomly​ selected, find the probability that fewer than 4 of them use their smartphones in meetings or classes.
The probability is

(5.2.23) Assume that when adults with smartphones are randomly​ selected, 43​% use them in meetings or classes. If 10 adult smartphone users are randomly​ selected, find the probability that at least 8 of them use their smartphones in meetings or classes.
The probability is?

(5.2.22) Assume that when adults with smartphones are randomly​ selected, 36​% use them in meetings or classes. If 25 adult smartphone users are randomly​ selected, find the probability that exactly 17 of them use their smartphones in meetings or classes.
The probability is? (round to four decimal)

(5.2.17) Assume that when adults with smartphones are randomly​ selected, 45​% use them in meetings or classes. If 5 adult smartphone users are randomly​ selected, find the probability that exactly 2 of them use their smartphones in meetings or classes
The probability is?

(5.2.19) Assume that random guesses are made for 8 ​multiple-choice questions on a test with 5 choices for each​ question, so that there are n=8 ​trials, each with probability of success​ (correct) given by p=20. Find the probability of no correct answers.
The probability of no correct answers is?

(5.2.17) Assume that random guesses are made for seven multiple choice questions on an SAT​ test, so that there are n=7 ​trials, each with probability of success​ (correct) given by p=0.35. Find the indicated probability for the number of correct answers.
Find the probability that the number x of correct answers is fewer than 4.
P(X<4)=? (Round to four decimal)

(3.3.25) Use the following cell phone airport data speeds​ (Mbps) from a particular network. Find P40.
0.1
0.2
0.3
0.5
0.6
0.6
0.7
0.7
0.8
0.8
0.8
0.8
0.8
0.9
0.9
1.3
1.4
1.5
1.6
1.6
1.6
2.1
2.1
2.4
2.4
2.5
3.4
3.6
4.1
4.2
4.5
4.6
5.7
6.7
7.7
8.1
8.5
12.6
12.6
12.8
12.8
13.3
13.3
13.7
14.2
14.3
15.1
15.5
15.6
28.6
P40=? Mbps

(3.3.22) Use the following cell phone airport data speeds​ (Mbps) from a particular network. Find Q3.
0.2
0.2
0.3
0.4
0.6
0.6
0.7
0.7
0.7
0.8
0.8
0.8
0.8
0.9
0.9
0.9
1.4
1.5
1.7
1.7
1.8
1.8
1.9
2.2
2.3
2.4
2.8
2.9
3.7
3.7
4.7
5.1
5.5
5.9
6.1
6.9
7.1
7.4
7.7
8.4
9.7
11.1
11.6
12.8
13.2
14.2
14.2
15.8
15.8
29.6
Q3= ? Mbps