Which of the following choices is the standard deviation of the sample shown here 18, 19, 20, 21, 22 a) 2.5 b) 20 c) /2.5 d) /2 e) 2

(D)

Step-by-step explanation:

The given data set is:

18, 19, 20, 21, 22

Mean of the given data set is given as:

Now,

Data values                                              

18                                                                              4

19                                                                              1

20                                                                             0

21                                                                              1

22                                                                             4

Now, variance is given as:

The standard deviation is the square root of the variance, thus

Thus, option (D) is correct.

3-4

step-by-step explanation:

the answer is 3-4 because both 45 and 60 has a multiple of 15.

45/3=15

60/4=15

therefore the odds against selecting a red is 4-3