orP 19) At a tenn is tournament a mean serve speed of of th statistician keeps t

Question

orP 19) At a tenn is tournament a mean serve speed of of th statistician keeps track of every serve. The statistician reported that the e serve speeds was 8 mph. If nothing is known about the shape of the distribution, give an a particular player was 102 miles per hour (mph) and the standard deviation 19) interval that will contain the speeds of at least three-fourths of the player's serves. A) 86 mph to 118 mph C) 94 mph to 110 mph B) 118 mph to 134 mph D) 78 mph to 126 mph 20) A study was designed to investigate the effects of two variables - () a student's level of 20) mathematical anxiety and (2) teaching method - on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught expo a standardized test. Assuming no information concerning the shape of the distribution is known, what percentage of the students scored between 420 and 580? using the traditional sitory method. These students obtained a mean score of 500 with a standard deviation of 40 on A) approximately 68% C) at least 75% B) at least 88.9% D) approximately 95% gives us a method of interpreting the standard deviation that 2) Fill in the blank. A) Chebyshev's rule and the empirical rule C) The Empirical Rule none of these D) Chebyshev's rule applies to any data set, regardless of the shape of the distribution.

Explanation / Answer

Solution:- option D) approximately 95%
Explanation:-
Given that mean = 500, sd = 40

P[(420-500)/40 < x < (580-500)/40]
P[ -2 < x < 2 ]
= 0.9544
= 95.44%

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