Typing speeds (words per minute) Offer No offer 7 5 3 2 3 5 8 8 6 4 3 1 0 4 0 2 3 4 7 8 8 5 5 3 2 5 4 4 6 6 7 8 8 8 9 3 6 4 7 9 9 Key: 32 $\leftarrow$ 2 | 3 | 5 $\rightarrow$ 35 (a) What were the ranges of typing speeds for the two groups? Offer No offer (b) Which group had the higher median typing speed? O Offer O No offer O The medians were the same (c) Which group had more typing speeds in the 40s? O Offer O No offer O Each had the same Explanation Check
Added by David C.
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The stem-and-leaf plot shows typing speeds in words per minute. The 'stem' is the tens digit, and the 'leaf' is the units digit. For example, in the key: 32 $\leftarrow$ 2 | 3 | 5 $\rightarrow$ 35 means that a leaf of 2 on the left side (Offer) with a stem of 3 Show more…
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(a) What were the ranges of typing speeds for the two groups? Offer No offer (b) Which group had the higher median typing speed? Offer No offer The medians were the same (c) Which group had more typing speeds in the 30s? Offer No offer Each had the same
Keondre P.
Suppose that the distribution of typing speed in words per minute (wpm) for experienced typists using a new type of split keyboard can be approximated by a normal curve with mean 68 wpm and standard deviation 17 wpm. What is the probability that a randomly selected typist's speed is at most 68 wpm? What is the probability that a randomly selected typist's speed is less than 68 wpm? What is the probability that a randomly selected typist's speed is between 34 and 85 wpm? (Round your answer to four decimal places.) Would you be surprised to find a typist in this population whose speed exceeded 119 wpm? (Round your numerical value to four decimal places.) It would ---Select--- (be, not be) surprising to find a typist in this population whose speed exceeded 119 wpm because this probability is ________ , which is ---Select--- (very small, very large) . Suppose that two typists are independently selected. What is the probability that both their typing speeds exceed 102 wpm? (Round your answer to three decimal places.) Suppose that special training is to be made available to the slowest 20% of the typists. What typing speeds would qualify individuals for this training? (Round your answer to the nearest whole number.) People with typing speeds of wpm and ---Select--- (above, below) would qualify for the training.
Ahmet Y.
1. You are given a Grouped Frequency Distribution Table of the speed in miles per hour (mph) attained by each observed Formula One driver from zero (0) to seven (7) seconds, during the first practice session in preparation for the Abu Dhabi Grand Prix of 2022 as shown in Figure 1 below: Interval | Frequency [f] | Cumulative Frequency | Midpoint [X] | X² | fX | fX² --- | --- | --- | --- | --- | --- | --- 30 < 48 | 3 | 3 | 39 | 1521 | 117 | 4563 48 < 66 | 6 | 9 | 57 | 3249 | 342 | 19494 66 < 84 | 8 | 17 | 75 | 5625 | 600 | 45000 84 < 102 | 6 | 23 | 93 | 8649 | 558 | 51894 102 < 120 | 2 | 25 | 111 | 12321 | 222 | 24642 TOTALS | | | | 31365 | 1839 | 145593 Figure 1 Calculate the mean speed in miles per hour attained between zero (0) and seven (7) for this distribution. (4 marks) A. 56.73 B. 75.63 C. 73.56 D. 76.05 2. Calculate the variance for the distribution given in Figure 1. (4 marks) A. 429.84 B. 492.98 C. 924.86 D. 942.99
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