The life of a battery used in a cardiac pacemaker is assumed to be normally distributed. a random sample of 10 batteries is subjected to an accelerated life test by running them continuously at an elevated temperature until failure, and the following lives are obtained: 25.5, 26.1, 26.8 23.2, 24.2, 28.4, 25.0, 27.8, 27.3, 25.7 (a)construct a 90% two-sided confidence interval on mean life in the accelerated test.(b)test the hypothesis, with α= 0.1 that the mean battery life is 26.5 h.
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1. 3. can also be expressed as (22/7)
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80° is the measure of gh
circle f is congruent to circle j
we have two circle with center f and j.
both circles are congruent. the radius of the circle would be equal.
see the attachment for the circle.
we are given ∠efd ≅ ∠gjh
therefore, arc (ed) = arc (gh) (∴ circle f is congruent to circle j)
but ∠dfe=80°=arc (ed)
therefore, arc (gh) = 80°
thus, 80° is the measure of gh