The marketing manager of a large retail company wants to analyze the number of small appliances sold at their stores. She selects a random sample of 70 stores, and records the number of small appliances sold in the month of September. Data show mean sales of 53 units of small appliances with a standard deviation of 12 units. a)Compute a 90% confidence interval for the average number of units sold at the stores. [2 pts] b)A similar study conducted last year showed that the stores sold on average 50 units. The marketing manager is happy because sales are up from 50% to 53%, that is a 3% increase. Explain in a language that the manager can understand why she cannot be certain that sales increased from last year. [2 pts]

well the answer to that is xoxoxo

step-by-step explanation:

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet

“ a line segment that has the endpoints on the circle and passes through the midpoint is called the diameter. the diameter is twice the size of the radius. a line segment that has its endpoints on the circular border but does not pass through the midpoint is called a chord. a circle is the same as 360 small circle up the number 0 . i hope this .