3. ( \( \$ \) points) Major League Baseball requires that its baseballs weigh at least 142 grams and no more than 149 grams. The weights of baseballs manufactured by a particular company are normally distributed with mean 146.5 grams and standard deviation 1.9 grams. What proportion of baseballs made by this company meet the major league standard for weight? (Round your answer to 3 decimal places.)

Find the midrange for the following group of data items. \[ 35,32,31,30,36,33,29,31 \] The midrange is \( \square \). (Type an integer or a decimal.)

The accompanying data describes the earnings of 15 celebrities. Complete parts (a) through (d). Click the icon to view the eamings of 15 celebrities. a. Find the mean. The mean earnings of the 15 celebrities is \( \$ \square \) million. (Round to the nearest tenth as needed.)

Find the mode for the following group of data items. If there is no mode, so state. \( 5.8,8,9.2,6.9,8.4,8.4,7.4,8.9,7.8,6.7,6.7 \) Select the correct choice below and, if necessary, fill in the answer box within your choice. A. The mode(s) is/are \( \square \). (Use a comma to separate answers as needed.) B. There is no mode.

Find the mode for the following group of data items. If there is no mode, so state. \( 2.9,5.1,6.3,4,5.5,5.5,4.5,6,4.9,3.8,3.8 \) Select the correct choice below and, if necessary, fill in the answer box within your choice. A. The mode(s) is/are B. There is no mode.

Compute the proportion of \( 95 \% \) confidence intervals that fail to circumscribe the true value of \( \mu \) equal to 22.5 grams for \( N=25 \) frogs. Round your answer to four decimal places.