Mathematics: Astudy was designed to investigate the effects of two variables long dash (1) a student s level of mathematical anxiety and (2) teaching method long dash on a student s achievement in a mathematics course. students who had a low level of mathematical anxiety were taught using the traditional expository method. these students obtained a mean score of 250 with a standard deviation of 40 on a standardized test. assuming a mound-shaped and symmetric distribution, in what range would approximately 99.7%

I believe it would be D. If d=7 then the equation would be 2x7 which would equal 14...

Astudy was designed to investigate the effects of

Jeiku3629

14.03.2022

$(130,\ 370)$

Step-by-step explanation:

Given : Sample Mean score : $\overline{x}=250$

Standard deviation : $\sigma=40$

The range that would represent the approximately 99.7% of the students score :-

$\overline{x}\pm 3\sigma$

i.e. $250\pm 3(40)/tex]i.e. [tex]250\pm 120/tex][tex]=(250-120,\ 250+120)=(130,\ 370)$

Hence, the range that represents the approximately 99.7% of the students score = $(130,\ 370)$

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