You are interested in determining which of two brands of light bulbs, brand a and brand b, lasts longer under differing conditions of use. fifty bovano lamps are fitted with brand a light bulbs and 50 bulbrite lamps are fitted with brand b light bulbs. each light bulb is left on for 20,000 hours straight. light bulb life is then measured for each bulb, and the average light bulb life for the two brands is compared. what is wrong with this experimental design?
(a) nothing is wrong with this design.
(b) the type of lamp is a confounding variable.
(c) not enough light bulbs of each type are used in the study.
(d) the experiment should have been conducted on more than two brands of lamps.
(e) average light bulb life is not a proper measure for comparison.

b. an equilateral triangle inscribed in a circle

step-by-step explanation:

we are given the figure of two circles having a triangle inside.

now, we know that,

"when a figure is lying inside an another figure, then the outside figure is known as circumscribed figure and the figure lying inside is referred to as the inscribed figure".

as we see that, the circles are containing the triangle completely.

thus, the circles are the circumscribed figures and the triangle is the inscribed figure.

hence, we get, 'an equilateral triangle is inscribed in a circle'.

720 oranges were in the shipment.

measurement of the swimming pool is given as = 7 yards 4.79 feet

first we will convert this to yards only.

1 foot = 0.33 yards

so, 4.79 feet = yards

so total yards are = yards

now we will convert this in meters.

1 yard = 0.914 meters

8.580 yards = meters

0.842 m = 0.842*100 = 84.2 cm

this becomes 7 meters and 84.2 cm

hence, the pool is 7 meters and 84.2 cm wide.