(d) Assume that the average life of a refrigerator is 15 years, with the standard deviation given in part (a) before it breaks. Suppose that a company guarantees refrigerators and will replace a refrigerator that breaks while under guarantee with a new one. However, the company does not want to replace more than 10% of the refrigerators under guarantee. For how long should the guarantee be made (rounded to the nearest tenth of a year)

19.1 years

Step-by-step explanation:

Average life of refrigerator = 15 years

lets assume standard deviation = 2.5

The company does not want to replace more than 10%

Determine how long the Guarantee issued by the company should last

since the  company doesn't want the replacement to exceed 10%

we will use the Z score corresponding to ( 100 - 10 ) = 90%

Z score = 1.645

The number of years

= 1.645 * std + 15

= (1.645 * 2.5 ) + 15 = 19.1125 ≈ 19.1 years

at home andrea has 1 2/3 kilograms of rice

step-by-step explanation:

stew reads at the fastest rate of 265 words per minute.

step-by-step explanation:

it's a given that felicia reads at 260 word per minute and on connie's graph we can see that she reads 200 words per minute. since stew's table tells us that he read 795 in 3 minutes, we can divide 795 by 3 to find out how many words he reads per minute.

795/3 = 265

stew reads 265 words per minute - he reads at the fastest rate since felecia reads at 260 words per minute and connie reads at 200 words per minute.

stew (265) > felecia (260) > connie (200)